character input error in my C program?

Question

I am new to C programming, I have made a simple calculator program in C.
The program runs but doesn't work, it works till value for b is entered after then when character input comes it doesn't ask for the input. I don't know why this is happening but is there any fix?

here's my code:

#include <stdio.h>
int main()
{
    float a,b;
    char op;
    printf("enter a: ");
    scanf("%f",&a);
    printf("enter b: ");
    scanf("%f",&b);
    printf("enter operation: ");
    scanf("%c",&op);
    switch(op)
    {
        case '+':
            printf("\n%.2f %c %.2f = %.2f",a,op,b,a+b);
            break;
        case '-':
            printf("\n%.2f %c %.2f = %.2f",a,op,b,a-b);
            break;
        case '*':
            printf("\n%.2f %c %.2f = %.2f",a,op,b,a*b);
            break;
        case '/':
            printf("\n%.2f %c %.2f = %.2f",a,op,b,a/b);
            break;
        default:
            printf("invallid input!!");
    }
    return 0;
}

The program seems to be absolutely correct but still there is something there I am missing. Answers are appreciated.

Answer 1

Just put a space before your enter operation's scanf() function's character format specifier and your program will work fine:

scanf( " %c" , &op );