CSE 102 - 01 : Basic Calculator In C Using If-Else

Source Code:

#include<stdio.h>

int main(){

    double a,b;
    char c;
    int d;
    printf("Operation signs:\n\tFor Addition\t\t: \tPress '+'\n\tFor subtraction \t: \tPress '-'\n\tFor multiplication \t: \tPress '*'\n\tFor division\t\t: \tPress '/' \n\nSelect an operation:\n");
    scanf("%c",&c);


    printf("Enter a number:\n");
    scanf("%lf",&a);
    printf("Enter another number: \n");
    scanf("%lf",&b);

    if ( c == '+'){
        printf("The sum of %lf & %lf is = %lf \n",a,b,a+b);
    }
    else if( c == '-' && a>=b ){
        printf("The difference of %lf & %lf is = %lf \n",a,b,a-b);
    }
    else if( c == '*' ){
        printf("The multiplication of %lf & %lf is = %lf \n",a,b,a*b);
    }
    else if( c == '/' && a>=b ){
        printf("The division of %lf & %lf is = %.3lf\n",a,b,a/b);

    }
    else {
      printf("\nERROR!");
    }
    return 0;
}

Sample Input-output: