Thread: Why i should command twice to execute this simple C program in Ubuntu Terminal?

Could you please let me know why i should command twice for running this C code in Ubuntu terminal gcc compiler. one for entering data another for (if) part

Code:

#include<stdio.h>
int main(){
    char p;
    printf(" Please enter the grade : ");
    scanf(" %c ", &p);
    if (p=='A') {
        printf("\n your score is excellent");
        }
    else if (p=='B'){
        printf("\n your score is good");
            }
    else if (p=='C'){
        printf("\n your score is fiar");
            }
    else if (p=='D'){
        printf("\n your score is poor");
            }
    else {
        printf("\n you should enetr 'A' or 'B' or 'C' or 'D' ");
        }
}

Thank you Dear. Salem.

Also try to leave meaningful comments in your code. This goes a long way in helping those that will read your code understand your thought trend or program flow.