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c_cpp
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#include <stdio.h> void calc(char opt, int n1, int n2, float *res) { switch (opt) { case '+': *res = n1 + n2; // add two numbers printf(" Addition of %d and %d is: %.2f\n", n1, n2, *res); break; case '-': *res = n1 - n2; // subtract two numbers printf(" Subtraction of %d and %d is: %.2f\n", n1, n2, *res); break; case '*': *res = n1 * n2; // multiply two numbers printf(" Multiplication of %d and %d is: %.2f\n", n1, n2, *res); break; case '/': if (n2 == 0) { printf("\n Divisor cannot be zero. Please enter another value: "); scanf("%d", &n2); } *res = n1 / (float)n2; // divide two numbers printf(" Division of %d and %d is: %.2f\n", n1, n2, *res); break; default: printf(" Something is wrong!! Please check the options\n"); } } char options() { char opt; printf(" Choose an operator (+, -, *, /) to perform the operation in C Calculator: "); scanf(" %c", &opt); // note the space before %c to skip whitespace characters getchar(); // consume newline character from the input buffer if (opt == '/') printf(" You have selected: Division\n"); else if (opt == '*') printf(" You have selected: Multiplication\n"); else if (opt == '-') printf(" You have selected: Subtraction\n"); else if (opt == '+') printf(" You have selected: Addition\n"); return opt; } void projectInfo() { printf("\n\t\t\t\t*************** Calculator Program ***************\n"); printf("\n\t\t\t\t------------- Submitted By ---------------\n"); printf("\n\t\t\t\t------------- Sharifa Siddika ---------------\n"); printf("\n\t\t\t\t----------- Submitted To ---------------\n"); printf("\n\t\t\t\t--------- Abdullah Ibn Obaidullah --------\n\n\n"); } int main() { projectInfo(); // declare local variables int n1, n2; float res; int choice = 1; while (choice == 1) { int cases; char opt; printf("\nPlease enter choice to proceed:\n"); printf("1. Project Info\n"); printf("2. Open Calculator\n"); printf("3. Exit\n"); scanf("%d", &cases); switch (cases) { case 1: projectInfo(); continue; case 2: opt = options(); printf(" Enter the first number: "); scanf("%d", &n1); printf(" Enter the second number: "); scanf("%d", &n2); calc(opt, n1, n2, &res); continue; case 3: choice = 2; break; } } printf("\n\n\n\t\t\t ************ THANKS ***************\n"); return 0; }