C Program to copy string using strcpy() Function

In this program we will copy one string into another, using the strcpy() method defined under the string.h library.

strcpy(destination, source) is a system defined method used to copy the source string into the destination variable.

Below is a program on strcpy() function.

#include<stdio.h> #include<string.h> // for using strcpy() function int main() { printf("\n\n\t\tStudytonight - Best place to learn\n\n\n"); char mj[100]; char aj[100]; printf("\n\nstrcpy(destination, source): is a system defined method used to copy the source string into the destination.\n\n"); printf("\n\nEnter the string: "); gets(aj); strcpy(mj, aj); printf("\n\nThe copied string is: %s\n\n", mj); printf("\n\n\t\t\tCoding is Fun !\n\n\n"); return 0; }

Output:

C Program to copy string without strcpy() function

What if you do not want to use the system defined function?

While initializing a string, there is no need to put a null character at the end, as the compiler provides it automatically.

For example, char aj[] = "aditya"; is a correct statement. However while copying one string into another, terminating the destination string with a null character is mandatory, to use it in future.

Below is a program for copying string without the use of strcpy() function.

#include<stdio.h> void stringCopy(char[], char[]); // function prototype declaration int main() { printf("\n\n\t\tStudytonight - Best place to learn\n\n\n"); char aj[100], mj[100]; printf("\n\nEnter 1st string: "); gets(aj); stringCopy(aj, mj); // function call printf("\n\nThe copied string is: %s\n\n", mj); printf("\n\n\t\t\tCoding is Fun !\n\n\n"); return 0; } void stringCopy(char a[], char b[]) // function definition { int i = 0; while(a[i] != '\0') { b[i] = a[i]; i++; } /* The string must always terminate with a '\0' - null character */ b[i] =' \0'; // most important step }

Output: