Question

Write a function to concatenate two strings using pointer notation

Answer 1

• I assume you are C/C++ because of pointer notation.
• Although I have tested my concatenate function in c,you can use this in c++.
• I have passed two string pointers in function and the string after concatenation will be pointed by first pointer.
• Rest I have tried to explain in comments.
• Below is the whole code in c with a function call in main function.

//Code starts here

#include <stdio.h>
void concatenate_string(char *a, char *b) //Arguments are pointers to strings a and b
{
while(*a) //Loop to move "a" to end of string
a++;

while(*b) //Now we will copy 'b' characters into 'a' until end of b
{
*a = *b;   
a++;
b++;
}
//Note that pointer a will point to concatenated string
*a = '\0'; // '/0' to terminate string
}
int main()
{
char a[100], b[100]; //Defining the two strings

printf("Enter source string\n");
gets(a); //Storing a through user input

printf("Enter string to concatenate\n");
gets(b);
//This function will concatenate a and b and result will be in a
concatenate_string(a, b);
//Printing a
printf("String after concatenation: %s", a);

return 0;
}

//Code ends here