File Input Output- C Programming MCQ Questions and Answers

#include <stdio.h>
int main()
{
    char i = '9';
    if (isdigit(i))
        printf("digit\n");
    else
        printf("not digit\n");
        return 0;
}

#include <stdio.h>
#include <stdlib.h>
int main()
{
    FILE *fp = stdout;
    int n;
    fprintf(fp, "%d", 45);
}

#include <stdio.h>
#include <math.h>
int main()
{
    int i = 10;
    printf("%f\n", log10(i));
    return 0;
}

char or EOF.isalpha(c) returns

fp = fopen("Random.txt", "a");