Sample C Program To Concatenate Two Strings.

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

int main()
{
char a[100], b[100];
printf(" Enter the first string " );
gets(a);

printf(" Enter the second string " );
gets(b);

strcat( a, b );
printf(" String obtained on concatenation is %s\n ", a );

getch();
return 0;

}

OUTPUT:

Enter the first string Team
Enter the second string mates
String obtained on concatenation is Teammates


C Program To Concatenate Two Strings Without Using strcat() Function.

#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);
    for(i=0; str1[i]!='\0'; ++i);

    for(j=0; str2[j]!='\0'; ++j, ++i)
    {
        str1[i]=str2[j];
    }
    str1[i]='\0';
    printf("\nOutput: %s",str1);
    return 0;
}


OUTPUT:

Enter First String: Concatenate
Enter Second String : Without strcat function
Output: ConcatenateWithout strcat function



C Program To Swap Two Strings.

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

main()
{

    char first[100], second[100], *temp;
    printf(" Enter the first string " );
    gets(first);

    printf(" Enter the second string " );
    gets(second);

    printf(" \nBefore Swapping\n " );
    printf(" First string: %s\n ", first );

    printf(" Second string: %s\n\n ", second );
    temp = ( char* )malloc( 100 );

    strcpy( temp, first );
    strcpy( first, second );
    strcpy( second, temp );

    printf(" After Swapping\n " );
    printf(" First string: %s\n ", first );
    printf(" Second string: %s\n ", second );

    getch();
    return 0;

}

OUTPUT:

Enter the first string little
Enter the second string flower

Before Swapping
First string: little
Second string: flower

After Swapping
First string: flower
Second string: little



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