The strncat function is one of the String Function, which is used to append n number of characters from user specified string to end of the existing string. In this article we will show you, How to use strncat in C Programming language with example.
C strncat syntax
The basic syntax of the strncat in C Programming language is as shown below.
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char *strncat(char *destination, char *source, size_t n); |
or we can simply write it as:
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strncat(str1, str2, string_size); |
- source: A valid string that you want to append to the destination
- destination: This is where the function will appeand the charcaters from Source.
- n: The number of character that you want to append from Source.
TIP: You have to include the #include<string.h> header before using this strncat string function.
strncat in C language Example
The strncat function is used to append the user specified string to existing string. This program will help you to understand the strncat with multiple examples.
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/* strncat in C Programming to concatenate strings */ #include <stdio.h> #include<string.h> int main() { char str1[] = "Learn"; char str2[] = "Learn"; char str3[] = " C Programming Language"; char str4[] = " at tutorialgateway.org"; strncat(str1, str3, 40); printf("\n The Final String after the Concatenation = %s", str1); strncat(str2, str3, 10); printf("\n The Final String after the Concatenation = %s", str2); strncat(str3, str4, 19); printf("\n The Final String after the Concatenation = %s", str3); getch(); return 0; } |
OUTPUT
ANALYSIS
This will appeand all the characters in str3 to str1 because, length of C Programming Language is less than the given size 40.
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strncat(str1, str3, 40); |
This will append first 10 characters present in str3 to str1 because, we are restricting the size to 10.
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strncpy(str2, str3, 10); |
strncat in C Example 2
This program allows the user to enter source and destination strings. Next, it is going to concat them using strncat function.
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/* string strncat in C programming Example */ #include <stdio.h> #include<string.h> int main() { char str1[100], str2[100]; printf("\n Please Enter First String : "); gets(str1); printf("\n Please Enter the String that you want to concat : "); gets(str2); strncat(str1, str2, 8); printf("\n The Final String after the Concatenation = %s", str1); } |
OUTPUT
Although, the given string is a valid one, strncat function only appended up to Tutorial. This is because, we restricted the concatination function to first 8 characters.
Let me change the Size value, and see
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