What will be the output of the program?

#include<stdio.h>
#include<string.h>

int main()
{
    char str1[5], str2[5];
    int i;
    gets(str1);
    gets(str2);
    i = strcmp(str1, str2);
    printf("%d\n", i);
    return 0;
}

A string is a collection of characters terminated by '\0'.

Step 1: char str[] = "India\0\CURIOUSTAB\0"; The variable str is declared as an array of characters and initialized with value "India"

Step 2: printf("%s\n", str); It prints the value of the str.

The output of the program is "India".

The function strlen returns the number of characters int the given string.

Therefore, strlen(str) becomes strlen("India") contains 5 characters. A string is a collection of characters terminated by '\0'.

The output of the program is "5".

Step 1: char str1[] = "Hello"; The variable str1 is declared as an array of characters and initialized with a string "Hello".

Step 2: char str2[] = "Hello"; The variable str2 is declared as an array of characters and initialized with a string "Hello".

We have use strcmp(s1,s2) function to compare strings.

Step 3: if(str1 == str2) here the address of str1 and str2 are compared. The address of both variable is not same. Hence the if condition is failed.

Step 4: At the else part it prints "Unequal".

Step 1: char str1[20] = "Hello", str2[20] = " World"; The variable str1 and str2 is declared as an array of characters and initialized with value "Hello" and " World" respectively.

Step 2: printf("%s\n", strcpy(str2, strcat(str1, str2)));

=> strcat(str1, str2)) it append the string str2 to str1. The result will be stored in str1. Therefore str1 contains "Hello World".

=> strcpy(str2, "Hello World") it copies the "Hello World" to the variable str2.

Hence it prints "Hello World".

printf("India", "CURIOUSTAB\n"); It prints "India". Because ,(comma) operator has Left to Right associativity. After printing "India", the statement got terminated.

Step 1: char *names[] = { "Suresh", "Siva", "Sona", "Baiju", "Ritu"}; The variable names is declared as an pointer to a array of strings.

Step 2: int i; The variable i is declared as an integer type.

Step 3: char *t; The variable t is declared as pointer to a string.

Step 4: t = names[3]; names[3] = names[4]; names[4] = t; These statements the swaps the 4 and 5 element of the array names.

Step 5: for(i=0; i<=4; i++) printf("%s,", names[i]); These statement prints the all the value of the array names.

Hence the output of the program is "Suresh, Siva, Sona, Ritu, Baiju".

Step 1: void fun(); This is the prototype for the function fun().

Step 2: fun(); The function fun() is called here.

The function fun() gets a character input and the input is terminated by an enter key(New line character). It prints the given character in the reverse order.

The given input characters are "abc"

Output: cba