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#include <stdio.h>
int main() {
char sent[64];
int index = 0;
printf("Write a sentence?\n");
scanf(" %64[^\n]", sent);
printf("Look up character at index?\n");
scanf("%d", &index);
printf("\nIn \"%s\" index %d is the character '%c'.\n", sent, index, sent[index]);
return 0;
}
///////////////////////
#include <stdio.h>
int main() {
float num[5], sum = 0, average;
printf("Please enter five real numbers:\n");
for (int i = 0; i < 5; i++) {
if (i == 0) {
printf("First number: \n");
} else if (i == 1) {
printf("Second number: \n");
} else if (i == 2) {
printf("Third number: \n");
} else if (i == 3) {
printf("Fourth number: \n");
} else {
printf("Fifth number: \n\n");
}
scanf("%f", &num[i]);
sum += num[i];
}
average = sum/5;
printf("The user entered:\n");
for (int i = 0; i < 5; i++) {
printf(" %f", num[i]);
if (i < 4) {
printf(" then,\n");
} else {
printf("\n\n");
}
}
printf("The average of these five numbers is: %f", average);
return 0;
}
///////////////////
#include <stdio.h>
int main() {
int base;
printf("Please enter a base:\n");
scanf("%d", &base);
printf("The powers of %d are: \n\n", base);
int result = 1; //start with power 0 which is always 1
for (int i = 0; i <= 8; i++) {
printf("%d ^ %d is %d\n", base, i, result);
result *= base; //Update the result by multiplying it by the base for the next power
}
return 0;
}
//////////////////////////////////
#include <stdio.h>
int main() {
char digits[9];
for (int i = 0; i < 9; i++) {
digits[i] = '\0';
}
printf("Input 8 digits or less:\n");
scanf("%8s", digits);
for (int i = 0; i < 9; i++) {
printf("digits[%d] is ASCII char: %c (%d) \n", i, digits[i], digits[i]);
}
return 0;
}
//////////////////
#include <stdio.h>
#include <string.h>
int main() {
char first_name[50], last_name[50], full_name[100], l_f[100];
printf("First name?\n");
scanf("%50s", first_name);
printf("Last name?\n\n");
scanf("%50s", last_name);
strcpy(full_name, first_name); //copy first_name to full_name
strcat(full_name, " "); //add a space
strcat(full_name, last_name); //concatenates last_name to full_name
printf("Full name: %s\n\n", full_name);
strcpy(l_f, last_name);
strcat(l_f, ", ");
strcat(l_f, first_name);
printf("Last, First: %s", l_f);
return 0;
}
//////////////////////////////
#include <stdio.h>
int main () {
float vector[3], scalar;
for (int i = 0; i < 3; i++) {
if (i == 0) {
printf("vx?\n");
} else if (i == 1) {
printf("vy?\n");
} else {
printf("vz?\n\n");
}
scanf("%f", &vector[i]);
}
printf("v = < %f, %f, %f >\n\n", vector[0], vector[1], vector[2]);
printf("Scalar Multiplier?\n");
scanf("%f", &scalar);
for (int i = 0; i < 3; i++) {
vector[i] = vector[i]*scalar;
}
printf("%fv = < %f, %f, %f >", scalar, vector[0], vector[1], vector[2]);
return 0;
}
///////////////////
#include <stdio.h>
int main() {
char first, last;
printf("What is the first letter of your first name?\n");
scanf(" %c", &first);
printf("What is the first letter of your last name?\n");
scanf(" %c", &last);
printf("Your initials are: %c%c", first, last);
return 0;
}
/////////////////////
#include <stdio.h>
int main() {
char first[32], last[32], course[64];
printf("First name?\n");
scanf("%32s", first);
printf("Last name?\n");
scanf("%32s", last);
printf("Course name?\n");
scanf(" %64[^\n]", course);
printf("\n%s %s is studying %s.", first, last, course);
return 0;
}
///////////////////////
#include <stdio.h>
int main() {
char c;
printf("Please input a letter, digit or symbol:\n");
scanf(" %c", &c);
printf("The ASCII value for %c in base-10 is %d\n", c, c);
printf("The ASCII value for %c in base-16 is 0x%x", c, c);
return 0;
}
/////////////////////////
#include <stdio.h>
int main() {
float num;
char string[20];
printf("Enter a real number:\n");
scanf("%f", &num);
printf("Converting float input into ASCII C-String array...\n\n");
sprintf(string, "%f", num);
for (int i = 0; i <= 7; i++) {
printf("Element %d is: '%c' which is ASCII %d\n", i, string[i], string[i]);
}
return 0;
}
///////////////////////////////
#include <stdio.h>
int main() {
char ch;
printf("Alphabet Facts!\n");
printf("^^^^^^^^^^^^^^^\n\n");
printf("Please input an uppercase letter:\n");
scanf(" %c", &ch);
printf("Some interesting facts:\n\n");
printf(" 1) The lowercase version of the letter is '%c'.\n\n", ch + 32);
printf(" 2) The letter '%c' comes before '%c' in the alphabet.\n\n", (char)(ch - 1), ch);
printf(" 3) The letter '%c' comes after '%c' in the alphabet.\n\n", (char)(ch + 1), ch);
printf(" 4) %c is letter number %d in the alphabet!", ch, ch - 'A' + 1);
return 0;
}
/////////////////////
#include <stdio.h>
#include <string.h>
int main() {
char original[6], copy[6];
printf("Type in a lowercase five letter word:\n\n");
scanf(" %5c", original);
strcpy(copy, original);
printf("Original: %s\n\n", copy);
for (int i = 0; i < 5; i++) {
copy[i] = copy[i] - ('a' - 'A');
}
printf("Copy: %s", copy);
return 0;
}
/////////////////////
#include <stdio.h>
#include <math.h>
int main () {
float angle, hypotenuse, opposite, adjacent, angle_radians;
printf("What is the angle in degrees?\n");
scanf("%f", &angle);
printf("What is the length of the hypotenuse?\n\n");
scanf("%f", &hypotenuse);
angle_radians = angle*(3.14159f / 180.0f);
opposite = sinf(angle_radians)*hypotenuse;
adjacent = cosf(angle_radians)*hypotenuse;
printf("The length of the opposite is: %f\n", opposite);
printf("The length of the adjacent is: %f", adjacent);
return 0;
}
/////////////////////////
#include <stdio.h>
int main() {
char colour[10];
printf("What is your favourite colour? \n");
scanf("%9s", colour);
printf("You like the colour %s.", colour);
return 0;
}
/////////////////////////
#include <stdio.h>
#include <math.h>
int main() {
float a, o, h;
printf("What is the length of the opposite side?\n");
scanf("%f", &o);
printf("What is the length of the adjacent side?\n");
scanf("%f", &a);
h = sqrt(o*o + a*a);
printf("The length of the hypotenuse is: %f", h);
return 0;
}
/////////////////////////////
#include <stdio.h>
#include <stdlib.h>
int main() {
int whole_number;
char text[80];
whole_number = 0;
printf("> ");
scanf("%79s", text);
whole_number = atoi(text);
printf("C-String: ");
printf("%s", text);
printf("\n");
printf("int: ");
printf("%d", whole_number);
return 0;
}
////////////////////
#include <stdio.h>
#include <math.h> // For log10f and floor functions
int main() {
float number;
int num_digits;
// Ask the user to input a number
printf("Input a number:\n");
scanf("%f", &number);
// Handle the case where the number is zero
if (number == 0) {
num_digits = 1; // Zero has 1 digit
} else if (number > 0) {
// Calculate the number of digits using log10f
num_digits = (int)(floor(log10f(number))) + 1;
} else {
// If the number is negative, work with the absolute value
num_digits = (int)(floor(log10f(fabs(number)))) + 1;
}
// Output the number of digits
printf("%.0f is %d digit(s).", number, num_digits);
return 0;
}
////////////////////////
#include <stdio.h>
int main() {
double numbers[7], product = 1.0;
// Input the 7 real numbers
for (int i = 0; i < 7; i++) {
printf("Input real number %d: \n", i + 1);
scanf("%lf", &numbers[i]);
}
// Print the numbers in the specified format
printf("\nInput was: { ");
for (int i = 0; i < 7; i++) {
printf("%.2f", numbers[i]);
if (i < 6) printf(", "); // Print a comma between numbers, but not after the last number
}
printf(" }\n");
// Calculate the product of the numbers
for (int i = 0; i < 7; i++) {
product *= numbers[i];
}
// Print the product
printf("\nThe product of the numbers input is: %.2f\n", product);
return 0;
}
/////////////////////////
#include <stdio.h>
int main() {
int whole_number;
char ascii_char;
float real_number;
// Prompt for whole number
printf("Whole number? \n");
scanf("%d", &whole_number);
// Prompt for ASCII character
printf("ASCII character? \n");
scanf(" %c", &ascii_char); // Note the space before %c to consume any lingering newline character
// Prompt for real number
printf("Real number? \n");
scanf("%f", &real_number);
// Echo inputs back to user with exact formatting
printf("\nThe user's input was:\n\n");
printf("Whole number is: %d\n", whole_number); // 5 spaces before the number
printf("ASCII character is: %c\n", ascii_char); // 3 spaces before the character
printf("Real number is: %.6f\n", real_number); // 6 spaces before the real number, 6 decimal places
return 0;
}
/////////////////
#include <stdio.h>
int main() {
int firstArray[3], secondArray[3], sum[3], diff[3], prod[3];
// First array setup
printf("First Array Setup...\n\n");
for (int i = 0; i < 3; i++) {
printf(" Please enter the %d%s value:\n", i + 1, (i == 0) ? "st" : (i == 1) ? "nd" : "rd");
scanf("%d", &firstArray[i]);
}
printf("\nFirst array is: { %d, %d, %d }\n", firstArray[0], firstArray[1], firstArray[2]);
// Second array setup
printf("\nSecond Array Setup...\n");
for (int i = 0; i < 3; i++) {
printf(" Please enter the %d%s value:\n", i + 1, (i == 0) ? "st" : (i == 1) ? "nd" : "rd");
scanf("%d", &secondArray[i]);
}
printf("\nSecond array is: { %d, %d, %d }\n", secondArray[0], secondArray[1], secondArray[2]);
// Calculations
printf("\n C..a..l..c..u..l..a..t..i..n..g..\n\n");
for (int i = 0; i < 3; i++) {
sum[i] = firstArray[i] + secondArray[i];
diff[i] = firstArray[i] - secondArray[i];
prod[i] = firstArray[i] * secondArray[i];
}
// Results
printf("Adding corresponding elements: { %d, %d, %d }\n\n", sum[0], sum[1], sum[2]);
printf("Subtracting corresponding elements: { %d, %d, %d }\n\n", diff[0], diff[1], diff[2]);
printf("Multiplying corresponding elements: { %d, %d, %d }\n", prod[0], prod[1], prod[2]);
return 0;
}
//////////////////////////
#include <stdio.h>
int main() {
char lowerChar, upperChar;
// Prompt for lower case character
printf("Input a lower case character:\n");
scanf("%c", &lowerChar); // Read the lower case character
// Clear the input buffer to prevent skipping the next input
getchar();
// Prompt for upper case character
printf("Input an upper case character:\n");
scanf("%c", &upperChar); // Read the upper case character
// Convert lower case to upper case using ASCII values
char convertedLower = lowerChar - 32; // Convert lower to upper
// Convert upper case to lower case using ASCII values
char convertedUpper = upperChar + 32; // Convert upper to lower
// Display the conversion results exactly as required
printf("\nlower %c equivalent upper is %c.\n", lowerChar, convertedLower);
printf("upper %c equivalent lower is %c.\n", upperChar, convertedUpper);
return 0;
}
//////////////////////////
#include <stdio.h>
#include <math.h> // For sqrtf function
int main() {
float adjacent, opposite, hypotenuse;
// Take input for adjacent and opposite sides
printf("Enter the length of the adjacent side: \n");
scanf("%f", &adjacent);
printf("Enter the length of the opposite side: \n");
scanf("%f", &opposite);
// Calculate the hypotenuse using the Pythagorean Theorem
hypotenuse = sqrtf((adjacent * adjacent) + (opposite * opposite));
// Display the hypotenuse length
printf("\nThe hypotenuse is %.6f in length.\n\n", hypotenuse);
// Display an ASCII triangle with labels
printf(" +\n");
printf(" |\\\n");
printf(" | \\\n");
printf(" %.6f| \\ %.6f\n", opposite, hypotenuse);
printf(" | \\\n");
printf(" | \\\n");
printf(" +-----+\n");
printf(" %.6f\n\n", adjacent);
// Note about scale
printf("Note: Right-angle triangle is not drawn to scale!\n");
return 0;
}
/////////////////////
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
char input[100];
int r = -1, g = -1, b = -1, count = 0;
printf("Input colour:\n");
scanf("%s", input);
// Parse RGB values
if (strstr(input, "r")) { r = atoi(strstr(input, "r") + 1); if (r >= 0 && r <= 255) count += 2; }
if (strstr(input, "g")) { g = atoi(strstr(input, "g") + 1); if (g >= 0 && g <= 255) count += 2; }
if (strstr(input, "b")) { b = atoi(strstr(input, "b") + 1); if (b >= 0 && b <= 255) count += 2; }
printf("\nSuccessfully parsed %d out of 6 items.\n", count);
if (r != -1 && g != -1 && b != -1) {
printf("\nColour channels detected: ( r, g, b )\n\n");
printf("r channel's value is %d (0x%x)\n", r, r);
printf("g channel's value is %d (0x%x)\n", g, g);
printf("b channel's value is %d (0x%x)\n", b, b);
} else {
printf("Invalid input.\n");
}
return 0;
}
////////////////////////////
#include <stdio.h>
#include <stdlib.h> // Include for atof()
int main() {
double real_number = 0.0; // Step 2: Declare and initialize the real_number
char text[80]; // Step 3: Declare the char array for input
// Step 4: Prompt the user
printf("> ");
// Step 5: Read input text from the user
scanf("%79s", text);
// Step 6: Convert the ASCII text to a floating-point number using atof
real_number = atof(text);
// Step 7: Print out the C-String
printf("C-String: ");
// Step 8: Print the input text
printf("%s\n", text);
// Step 9: Newline after the string output
// Step 10: Print "double: "
printf("double: ");
// Step 11: Print the floating-point number
printf("%f\n", real_number);
return 0;
}
/////////////////////
#include <stdio.h>
int main() {
int number;
char numberStr[9]; // Array to store the number as a C-String (8 digits + null terminator)
// Step 1: Prompt the user to input a whole number (8 digits or less)
printf("Enter a whole number (eight digits or less): \n");
scanf("%d", &number);
// Step 2: Convert the integer to a C-String with leading zeros (using %08d)
printf("Converting int input into ASCII C-String array...\n\n");
sprintf(numberStr, "%08d", number);
// Step 3: Print the individual characters (ASCII values) of the numberStr array
for (int i = 0; i < 8; i++) {
printf("Element %d is: '%c' which is ASCII %d\n", i, numberStr[i], numberStr[i]);
}
return 0;
}
/////////////////////
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