Untitled

#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;
}