/* C Program to accept two strings and concatenate them i.e.The second string is appended to the end of the first string */

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

void main()
{
char string1[20], string2[20];
int i,j,pos;

strset(string1, ‘\0′); /*set all occurrences in two strings to NULL*/
strset(string2,’\0′);

printf(“Enter the first string :”);
gets(string1);
fflush(stdin);

printf(“Enter the second string:”);
gets(string2);

printf(“First string  = %s\n”, string1);
printf(“Second string = %s\n”, string2);

/*To concatenate the second string to the end of the string
traverse the first to its end and attach the second string*/

for (i=0; string1[i] != ‘\0′; i++)
{
;      /*null statement: simply traversing the string1*/
}

pos = i;

for (i=pos,j=0; string2[j]!=’\0′; i++)
{
string1[i] = string2[j++];
}

string1[i]=’\0′;   /*set the last character of string1 to NULL*/

printf(“Concatenated string = %s\n”, string1);
}

/*—————————————
Output
Enter the first string :CD-
Enter the second string:ROM
First string  = CD-
Second string = ROM
Concatenated string = CD-ROM
—————————————-*/

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