else if, C (gcc) - rextester

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//gcc 5.4.0

#include  <stdio.h>

int main(void)
{
    //printf("Hello, world!\n");
    //int x;
    //int y;
    //x= 50;
    //(x > 50) ? (y=50) : (y=x);
    //    printf("y= %d\n", y);
    
    //int x= 6;
    //(x==0 || x==1) ? printf("Binary\n") : printf("No Binary\n");
    
    int myVal;
    printf("0: Main Menu\n");
    printf("0: Open File\n");
    printf("0: Print File\n");
    printf("0: Quit\n");
    printf("\n\Choose any option: \n");
    scanf("%d\n", &myVal);
    switch (myVal) {
        case 0:
        printf("Main Menu\n");
        break;
        case 1:
        printf("Open File\n");
        break;
        case 2:
        printf("Print File\n");
        break;
        case 3: 
        printf("Quit\n");
        break;
        default:
        printf("No Option\n");
        break;
    }
    
    if (myVal==0)
        printf("Main Menu\n");
    else if (myVal==1)
        printf("Open File\n");
    else if (myVal==2)
        printf("Print File\n");
    else if (myVal==3)
        printf("Quit\n");
    else if (myVal>=3);
         printf("No Option\n");
        
    return 0;
}

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Compilation time: 0.14 sec, absolute running time: 0.25 sec, cpu time: 0.16 sec, memory peak: 3 Mb, absolute service time: 0,46 sec