Online C Programming Test - C Programming Test 2

How many times the while loop will get executed if a short int is 2 byte wide?

#include<stdio.h>
int main()
{
    int j=1;
    while(j <= 255)
    {
        printf("%c %d\n", j, j);
        j++;
    }
    return 0;
}

Which of the following errors would be reported by the compiler on compiling the program given below?

#include<stdio.h>
int main()
{
    int a = 5;
    switch(a)
    {
	case 1:
	printf("First");

	case 2:
	printf("Second");

	case 3 + 2:
	printf("Third");

	case 5:
	printf("Final");
	break;

    }
    return 0;
}

Point out the error, if any in the program.

#include<stdio.h>
int main()
{
    int P = 10;
    switch(P)
    {
       case 10:
       printf("Case 1");

       case 20:
       printf("Case 2");
       break;

       case P:
       printf("Case 2");
       break;
    }
    return 0;
}

What will be the output of the program?

#include<stdio.h>
int main()
{
    int i=2;
    printf("%d, %d\n", ++i, ++i);
    return 0;
}

In the expression a=b=5 the order of Assignment is NOT decided by Associativity of operators

What is the notation for following functions?

1.  int f(int a, float b)
    {
        /* Some code */
    }

2.  int f(a, b)
    int a; float b;
    {
        /* Some code */
    }

How many times the program will print "IndiaBIX" ?

#include<stdio.h>

int main()
{
    printf("IndiaBIX");
    main();
    return 0;
}

What will be the output of the program?

#include<stdio.h>
#define SQR(x)(x*x)

int main()
{
    int a, b=3;
    a = SQR(b+2);
    printf("%d\n", a);
    return 0;
}

A preprocessor directive is a message from programmer to the preprocessor.

What will be the output of the program ?

#include<stdio.h>

int main()
{
    char *p;
    p="hello";
    printf("%s\n", *&*&p);
    return 0;
}

How will you free the allocated memory ?

In a file contains the line "I am a boy\r\n" then on reading this line into the array str using fgets(). What will str contain?

Which files will get closed through the fclose() in the following program?

#include<stdio.h>

int main()
{
    FILE *fs, *ft, *fp;
    fp = fopen("A.C", "r");
    fs = fopen("B.C", "r");
    ft = fopen("C.C", "r");
    fclose(fp, fs, ft);
    return 0;
}

If the file 'source.txt' contains a line "Be my friend" which of the following will be the output of below program?

#include<stdio.h>

int main()
{
    FILE *fs, *ft;
    char c[10];
    fs = fopen("source.txt", "r");
    c[0] = getc(fs);
    fseek(fs, 0, SEEK_END);
    fseek(fs, -3L, SEEK_CUR);
    fgets(c, 5, fs);
    puts(c);
    return 0;
}

According to ANSI specifications which is the correct way of declaring main when it receives command-line arguments?

What will be the output of the program (myprog.c) given below if it is executed from the command line?
cmd> myprog one two three

/* myprog.c */
#include<stdio.h>
#include<stdlib.h>

int main(int argc, char **argv)
{
    printf("%s\n", *++argv);
    return 0;
}

Point out the correct statement which correctly allocates memory dynamically for 2D array following program?

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

int main()
{
    int *p, i, j;
    /* Add statement here */
    for(i=0; i<3; i++)
    {
        for(j=0; j<4; j++)
        {
            p[i*4+j] = i;
            printf("%d", p[i*4+j]);
        }
    }
    return 0;
}

malloc() allocates memory from the heap and not from the stack.

Point out the error in the following program.

#include<stdio.h>
#include<stdarg.h>
void display(char *s, ...);
int fun1();
int fun2();

int main()
{
    int (*p1)();
    int (*p2)();
    p1 = fun1;
    p2 = fun2;
    display("IndiaBIX", p1, p2);
    return 0;
}
void display(char *s, ...)
{
    int (*pp1)();
    int (*pp2)();
    va_list ptr;

    va_start(ptr, s);
    pp1 = va_arg(ptr, int(*)());
    (*pp1)();

    pp2 = va_arg(ptr, int(*)());
    (*pp2)();

}
int fun1()
{
    printf("Hello");
}
int fun2()
{
    printf("Hi");
}

What do the following declaration signify?

int (*ptr)[30];