/* String concatenate and length -  Program to concatenate two strings and find string length using functions */

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

void  concatenate(char  str1[ ], char  str2[ ]) ;
int  stringlength(char  str[ ]) ;

void main()
{
    char  str1[50], str2[50], str[50] ;
    clrscr();
    printf("Performing string concatenation \n") ;
    printf("Enter two strings:\n") ;
    gets(str1) ;
    gets(str2) ;
    concatenate(str1,str2) ;
    printf("Concatenated string is: ") ;
    puts(str1);
    printf("\nFinding string length \n") ;
    printf("Enter a string: ") ;
    gets(str) ;
    printf("String length is: %d", stringlength(str) ) ;
    getch();
}

void  concatenate(char  str1[ ], char  str2[ ])
{
    int  i, j ;
    for(i=0 ; str1[i]!='\0' ; i++) ;
    for(j=0 ; str2[j]!='\0' ; j++, i++)
        str1[i]=str2[j] ;
    str1[i]='\0' ;
}

int  stringlength(char  str[ ])
{
    int  i ;
    for(i=0 ; str[i]!='\0' ; i++) ;
    return  i ;
}

/*
Output:

Performing string concatenation
Enter two strings:
New
York
Concatenated string is: NewYork

Finding string length
Enter a string: Apple
String length is: 5
*/