[Solved] Exit when press 0 in C [duplicate]

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Exapmple One of the ways.

#include <stdio.h>
#include <stdlib.h>

void end_proc(void){
    printf("Quitting the program...\n\n");
    exit(0);
}

void input_error_proc(void){
    int ch;
    printf("ERROR\n");
    while((ch = getchar()) != '\n' && ch != EOF);//clear input
}

int main(void){
    int program;

    while(1){
        printf("\n"
            "Choose one of the following programs: \n\n"
            " (1) Fibonacci Sequence Calculator \n"
            " (2) Decimal and Binary Calculator \n"
            " (3) Prime Number Calculator \n"
            " \n"
            "If you want to exit the program, press (e or 0).\n"
            "Your choice: ");

        if(1==scanf("%d", &program)){//input number 
            if (program == 0){
                end_proc();
            } else if(program == 1){
                printf ("FIBONACCI SEQUENCE CALCULATOR");
            } else if(program==2) {
                printf("DECIMAL AND BINARY CALCULATOR");
            } else if(program==3) {
                printf("PRIME NUMBER CALCULATOR");
            } else {
                input_error_proc();
            }
        } else {//input not number
            char ch, check;
            if(2 == scanf(" %c%c", &ch, &check) && ch == 'e' && check == '\n')
                end_proc();
            else
                input_error_proc();
        }
    }
    return 0;
}

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solved Exit when press 0 in C [duplicate]