List of top Programming and Data Structures Questions on Programming in C asked in GATE CS

Consider the following ANSI-C program.

#include <stdio.h>

int main(){
    int *ptr, a, b, c;
    a=5; b=11; c=20;
    ptr=&a; *ptr=c; ptr=&c;
    a=*(&b); c=*ptr-a;
    printf("%d",c);
    return(0);
}

The output of this program is ______.

Note: Assume that the program compiles and runs successfully.

What is printed by the following ANSI C program?

#include<stdio.h>
int main(int argc, char argv[])
{
	int a[3][3][3] = {
		{1, 2, 3, 4, 5, 6, 7, 8, 9},
		{10, 11, 12, 13, 14, 15, 16, 17, 18},
		{19, 20, 21, 22, 23, 24, 25, 26, 27}};
	int i = 0, j = 0, k = 0;
	for( i = 0; i < 3; i++){
		for(k = 0; k < 3; k++)
			printf("%d ", a[i][j][k]);
		printf("\n");
	}
	return 0;
}

What is printed by the following ANSI C program?

#include<stdio.h>
int main(int argc, char argv[])
{
	char a = 'P';
	char b = 'x';
	char c = (a & b) + '';
	char d = (a | b) - '-';
	char e = (a ^ b) + '+';
	printf("%c %c %c\n", c, d, e);
	return 0;
}

ASCII encoding for relevant characters is given below

Consider the following ANSI C program.

#include <stdio.h>
int main(){
    int arr[4][5];
    int i, j;
    for (i=0; i<4; i++){
        for (j=0; j<5; j++){
            arr[i][j] = 10*i + j;
        }
     }
    printf("%d", *(arr[1] + 9));
    return 0;
}

What is the output of the above program?

Consider the following ANSI C program.

#include <stdio.h> 
int main() 
{ 
	int i, j, count; 
	count = 0; 
	i = 0; 
	for (j = -3; j <= 3; j++) 
	{ 
		if ((j >= 0) && (i++)) 
		count = count + j; 
	} 
	count = count + i; 
	printf("%d", count); 
	return 0; 
}

Which one of the following options is correct?

Consider the following ANSI C function:

int SimpleFunction(int Y[], int n, int x) 
{ 
	int total = Y[0], loopIndex; 
	for (loopIndex = 1; loopIndex <= n - 1; loopIndex++) 
		total = x * total + Y[loopIndex]; 
	return total; 
}

Let \( Z \) be an array of 10 elements with \( Z[i] = 1 \), for all \( i \) such that \( 0 \le i \le 9 \). The value returned by SimpleFunction(\( Z, 10, 2 \)) is \(\underline{\hspace{2cm}}\).