How To Write strcpy Program In C / strcpy function in c

 strcpy function in c programming use to copy a sting from one variable to another variable. This article will help you to teach how to write the strcpy program in c programming.

 

How to Write strcpy Program In C

strcpy is an library function in c so you have to define <string.h> Library in header of c program and this function return copied value.

Syntax:-

char *strcpy(char *val1, const char *val2);

strcpy program in c programming

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

int main() {
   char val1[20] = "strcpy C program";
   char val2[20];

   // copying str1 to str2
   strcpy(val2, val1);

   puts(str2); // Output(strcpy C program)

   return 0;
}

strcpy function can be used with ANSI/ISO 9899-1990 version.

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Written C Program for strcmp() and strncmp()

 Learn to usestrcmp() and strncmp()  Library function in c which is defined in <string.h>. 

Here str1 and str2 are two strings for comparison.

The strcmp Function compares str1 to str2 in c program. If str1 is bigger than or adequate to str2, then str1 is a smaller amount than or greater than zero, which returns zero.

The function strncmp in c compares str2 to the n characters of the str1 string. The return value of strncmp is adequate to strcmp.

The positive and negative value given by the strncmp function is that the numerical difference between the primary mismatched characters within the strings.

Str1 and str2 are often character array variables or string constants.

C program for strcmp() and strncmp()

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

int main()
{
   char str1[ ] = "Computerinhindi"; //initialize character array
   char str2[ ] = "Computerinhindi"; 
   char str3[ ] = "Computerinhindi"; 

   printf("str1 = %s\n"
          "str2 = %s\n"
          "str3 = %s\n\n", str1, str2, str3);

   //comparing given strings
   printf("strcmp(str1, str2) = %d\n", strcmp(str1, str2));
   printf("strcmp(str2, str3) = %d\n", strcmp(str2, str3));
   printf("strcmp(str3, str1) = %d\n\n", strcmp(str3, str1));

   //comparing n characters with help of library function
   printf("strncmp(str1, str3, 3) = %d\n", strncmp(str1, str3, 3));
   printf("strncmp(str1, str3, 6) = %d\n", strncmp(str1, str3, 6));
   printf("strncmp(str3, str1, 6) = %d\n\n", strncmp(str3, str1, 6));

   return 0;
}

OUTPUT For Written C Program for strcmp()

 and strncmp(): - 

strcmp() and strncmp()

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How to use strlen() function in c

This c program example will help you to find the length of string in c programming with the help of strlen() function in c :-

 

How to use strlen() function in c

 

main()
{
    char s1[20];
    int len;
    printf("\nEnter a string to find it's length: ");
    gets(s1);
    len = strlen(s1);
    printf("\ngive the length of string: %d", len);
    getch();
}

Output

Enter a string to find it's length:-functioninc

give the length of string:-11

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C program to seek out the length of the string with or without using strlen function in c

 Here we'll write a C program to seek out the length of the string. The length of the "Computerinhindi" string is 15.

C program to seek out the length of the string with or without using strlen function in c

Find string length without using string library functions in C programming

To find the length, use for loop or while loop. The program below uses the for loop to check the string length in c program.

#include
int main()
{
     char st[200];
     int i;

     printf("Enter a string: ");
     scanf("%[^\n]",str);

     for(i=0;st[i]!='\0';i++);

     printf("length of given string is=%d",i);

     return 0;
}

The variable i is initialized with 0 inside the for loop. Now the condition str [i]! = '\ 0' are going to be checked for every character within the string. When the condition is true, the worth of the variable i will be able to increment.  

At the top of the string, it encounters a null character ("\ 0") therefore the condition becomes false and therefore the value of the variable i will be able to not increment, loop terminated. Finally, we get the length of the string without employing a built-in strlen () function in C program.

C Program to check String length using strlen()

•  The strlen () function returns the length of the string passed.
•  strlen () doesn't count the null character "\ 0"
•  the specified header file may be a string.

#include
#include
int main()
{
     char a[20]="Computerinhindi";
     char b[20]={'C','O','R','N','N','E','R','\0'};
     char c[20];

     printf("Enter a string: ");
     scanf("%[^\n]",c);

     printf("Length of given string in c program %s =%ld\n",a,strlen(a));
     printf("Length of given string %s =%ld\n",b,strlen(b));
     printf("Length of string in c program %s =%ld\n",c,strlen(c));

     return 0;
 }

Here is that the C program to seek out the length of the string, to require user input we will use gets () or fgets (). The fgets () function also returns the newline character to the string. 

If you employ the fgets () function as shown below, you'll get result = (actual length + 1). The gets () takes an equivalent input length as [^ \ n] took. For an equivalent string, gets () gives the length 14 except for fgets () gives the length 15.

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