strcmp() In C

Purpose of strcmp()

strcmp() is one of the inbuilt string function in c programming which is used to compare two strings, if the strings are same then the function returns 0. Otherwise it returns a nonzero value.

How strcmp() Works

The following diagram clearly illustrate the working principle of strcmp() inbuilt string function in C.

Syntax - strcmp()

• strcmp() accepts two parameters.
• Both parameters must be a string.
• To use strcmp() inbuilt string function in C, we need to declare #include<string.h> header file.

strcmp(str1, str2);

C Program - strcmp()

Let us work through strcmp() function. In the following program we will compare two strings using strcmp() inbuilt string function.

#include <stdio.h>
#include<string.h>
int main()
{
char str1[20] = "this is strcmp", str2[20] = "this is strcmp";
if(strcmp(str1, str2) == 0)
printf("The strings str1 and str2 are same ");
return 0;
}

The strings str1 and str2 are same

C Program - Without strcmp()

Let us compare two strings without using inbuilt string function strcmp().

#include <stdio.h>
#include<string.h>
int main()
{
char str1[20] = "this is strcmp";
char str2[20] = "this is strcmp";
int i, j = 0;
for(i=0; str1[i]!='\0'; i++){
if(str1[i] == str2[i]) {
j++;
}
else {
j++;
printf("The strings str1 and str2 are not equal");
break;
}
}
if(i==j)
printf("The strings str1 and str2 are equal");
return 0;
}

The strings str1 and str2 are same

strcmp() table

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