Question

How to use function pointer to call different functions in C

Answer 1

#include <stdio.h>

void f1(void) {
    puts("f1");
}

void f2(void) {
    puts("f2");
}

void f3(void) {
    puts("f3");
}

void general(void) {
    puts("general");
}

void control(int x) {
    void (*p)(void);

    if (x == 1)
        p = f1;
    else if (x == 2)
            p = f2;
        else if (x == 3)
                p = f3;
            else
                p = general;
    p();
  }

int main(void)
{
    for (;;) {
        int x;

        printf("Enter a number (0 to exit): ");
        scanf("%d", &x);

        if (x == 0)
            break;

        control(x);
    }

    return 0;
}




/*
run:

Enter a number (0 to exit): 1
f1
Enter a number (0 to exit): 2
f2
Enter a number (0 to exit): 3
f3
Enter a number (0 to exit): 4
general
Enter a number (0 to exit): 15
general
Enter a number (0 to exit): 0

*/

 

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