Question

c program to concatenate two strings without using library functions

Answer 1

Answer:

#include <stdio.h>

int main()

{

char str1[50], str2[50], i, j;

printf("\nEnter first string: ");

scanf("%s",str1);

printf("\nEnter second string: ");

scanf("%s",str2);

/* This loop is to store the length of str1 in i

* It just counts the number of characters in str1

* You can also use strlen instead of this.

*/

for(i=0; str1[i]!='\0'; ++i);

/* This loop would concatenate the string str2 at

* the end of str1

*/

for(j=0; str2[j]!='\0'; ++j, ++i)

{

str1[i]=str2[j];

}

// \0 represents end of string

str1[i]='\0';

printf("\nOutput: %s",str1);

return 0;

}

Answer 2

Answer:

Step 1. input

let two string variable s1 and s2 having input

s1 = “Ankit”;

s2 = “Singh”;

Step 2. Found Last position

Then found length of first string

= strlen(s1);

= strlen(“Ankit”);

= 5

Last position of s1 = 5

STEP 3. Concatenat

Now we can Concatenat second string using for loop

s1[5] = “S”

s1[6] = “i”

s1[7] = “n”

s1[8] = “g”

s1[9] = “h”