Untitled

10. Write functions to implement string operations such as copy, compare and
concatenate using user defined functions
#include<stdio.h>
int Length(char s1[]);
int compare(char s1[], char s2[]);
void concat(char s1[], char s2[]);
int main()
{
char s1[200], s2[100];
int len,res,count;
printf("\nEnter the String s1: ");
gets(s1);
printf("\nEnter String s2 :");
gets(s2);
len = Length(s1);
printf("\nLength of the String s1 is : %d", len);
res = compare(s1, s2);
if(res == 0)
{
printf("\nBoth the Strings are Equal\n");
}
else
{
printf("\nThe Strings are not Equivalent\n");
}
concat(s1, s2);
printf("\nConcated string is :%s", s1);
return(0);
}
int Length(char s1[])
{
int len = 0;
while (s1[len] != '\0')
len++;
return (len);
}
int compare(char s1[], char s2[])
{
int count = 0;
while(s1[count] == s2[count])
{
if(s1[count] == '\0' || s2[count] == '\0')
break;
else count++;
}
if(s1[count] == '\0' && s2[count] == '\0')
return 0;
else
return -1;
}
void concat(char s1[], char s2[])
{ int i, j;
i = strlen(s1);
for (j = 0; s2[j] != '\0'; i++, j++)
{
s1[i] = s2[j];
}
s1[i] = '\0';
}





11. Write functions to implement string operations such as compare, reverse
and find string length. Use the parameter passing techniques.
#include <stdio.h>
#include <string.h>
int compare_strings(char str1[], char str2[]) {
int i = 0;
while (str1[i] == str2[i] && str1[i] != '\0' && str2[i] != '\0') {
 i++;
}
return str1[i] - str2[i]; // Returns 0 for equal, negative for str1 < str2, positive for
str1 > str2
}
Void reverse_string(char str[])
{
int len = strlen(str);
for (int i = 0; i < len / 2; i++) {
 char temp = str[i];
 str[i] = str[len - i - 1];
 str[len - i - 1] = temp;
}
}
int find_string_length(char str[]) {
int len = 0;
while (str[len] != '\0') {
 len++;
}
return len;
}
int main() {
char str1[50], str2[50];
printf("Enter the first string: ");
fgets(str1, 50, stdin); // Use fgets to handle spaces in input
str1[strcspn(str1, "\n")] = '\0'; // Remove trailing newline
printf("Enter the second string: ");
fgets(str2, 50, stdin);
str2[strcspn(str2, "\n")] = '\0';
int comparison = compare_strings(str1, str2);
if (comparison == 0) {
 printf("The strings are equal.\n");
} else if (comparison < 0) {
 printf("The first string is lexicographically smaller.\n");
} else {
 printf("The second string is lexicographically smaller.\n");
}
reverse_string(str1);
printf("Reversed first string: %s\n", str1);
int length = find_string_length(str2);
printf("Length of second string: %d\n", length);
return 0;
}




12. Write a program to convert given binary to decimal using function.
#include <stdio.h>
int convert(int);
int main()
{
int dec, bin;
printf("Enter a binary number: ");
scanf("%d", &bin);
dec = convert(bin);
printf("The decimal equivalent of %d is %d.\n", bin,dec);
return 0;
}
int convert(int bin)
{
if (bin == 0)
{ 
return 0;
}
else
{
return (bin % 10 + 2 * convert(bin / 10));
} 



13. Implement structures to read, write and compute average marks of the
students, list the students scoring above and below the average marks for a
class of N students.
#include <stdio.h>
struct student
{
char usn[50];
char name[50];
int marks;
}
s[10];
void main()
{
int i,n,countav=0,countbv=0;
float sum,average;
printf("Enter number of Students\n");
scanf("%d",&n);
printf("Enter information of students:\n");
for(i=0; i<n;i++)
{
printf("Enter USN: ");
scanf("%s",s[i].usn);
printf("Enter name: ");
scanf("%s",s[i].name);
printf("Enter marks: ");
scanf("%d",&s[i].marks);
printf("\n");
}
for(i=0;i<n;i++)
{
sum=sum+s[i].marks;
}
average=sum/n;
printf("\nAverage marks: %f",average);
countav=0;
countbv=0;
for(i=0;i<n;i++)
{
if(s[i].marks>=average)
countav++;
else
countbv++;
}
printf("\nTotal No of students above average= %d",countav);
printf("\nTotal No of students below average= %d",countbv);
}



14. Develop a program using pointers to compute the sum mean and standard
deviation of all elements stored in an array of N real numbers.
#include<stdio.h>
#include <conio.h>
#include <math.h>
int main()
{
float a[10], *ptr, mean, std, sum=0, sumstd=0;
int n,i;
printf("Enter the no of elements\n");
scanf("%d",&n);
printf("Enter the array elements\n");
for(i=0;i<n;i++)
{
scanf("%f",&a[i]);
}
ptr=a;
for(i=0;I <n;i++)
{
sum=sum+ *ptr;
ptr++;
}
mean=sum/n;
ptr=a;
for(i=0;I <n;i++)
{
sumstd=sumstd + pow((*ptr - mean),2);
ptr++;
}
std= sqrt(sumstd/n);
printf("Sum=%.3f\t",sum);
printf("Mean=%.3f\t",mean);
printf("Standard deviation=%.3f\t",std);
return 0;
}



15. Write a c program to copy a text file to another , reading both the input file
name and target file name.