How to get Substring before Specific Character in C - Step by Step Examples

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How to get Substring before Specific Character in C ?

Answer

To get the substring before a specific character in C, you can use the strncpy function from the string.h library.

✐ Examples

1 Get Substring Before Specific Character

In this example,

We include the necessary header stdio.h for standard input/output functions and string.h for string handling functions.
We create a character array named str with a string value and a character variable ch representing the specific character.
We use the strchr function to find the first occurrence of ch in str and store the pointer to this position.
If the character is found, we calculate the length of the substring before ch.
We use the strncpy function to copy the substring to a new character array named substr.
We ensure that the copied substring is null-terminated.
Finally, we print the substring to standard output.

C Program

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

int main() {
    char str[] = "hello world, how are you?";
    char ch = ',';
    char *pos = strchr(str, ch);
    if (pos != NULL) {
        int len = pos - str;
        char substr[len + 1];
        strncpy(substr, str, len);
        substr[len] = '\0';
        printf("%s\n", substr);
    } else {
        printf("Character not found in the string.\n");
    }
    return 0;
}

Output

hello world

2 Get Substring Before Specific Character in a Different String

In this example,

We include the necessary header stdio.h for standard input/output functions and string.h for string handling functions.
We create a character array named str with a different string value and a character variable ch representing the specific character.
We use the strchr function to find the first occurrence of ch in str and store the pointer to this position.
If the character is found, we calculate the length of the substring before ch.
We use the strncpy function to copy the substring to a new character array named substr.
We ensure that the copied substring is null-terminated.
Finally, we print the substring to standard output.

C Program

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

int main() {
    char str[] = "user@example.com";
    char ch = '@';
    char *pos = strchr(str, ch);
    if (pos != NULL) {
        int len = pos - str;
        char substr[len + 1];
        strncpy(substr, str, len);
        substr[len] = '\0';
        printf("%s\n", substr);
    } else {
        printf("Character not found in the string.\n");
    }
    return 0;
}

Output

user

Summary

In this tutorial, we learned How to get Substring before Specific Character in C language with well detailed examples.

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How to get Substring before Specific Character in C - Step by Step Examples

How to get Substring before Specific Character in C ?

Answer

✐ Examples

1 Get Substring Before Specific Character

C Program

Output

2 Get Substring Before Specific Character in a Different String

C Program

Output

Summary

More C Strings Tutorials