Question

How to remove punctuation from a string in C

Answer 1

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

void remove_punctuation_from_string(char* p) {
    char* src = p, * dest = p;

    while (*src) {
        if (ispunct((unsigned char)*src)) {
            src++; // Skip punctuation character
        }
        else if (src == dest) {
            src++;
            dest++;
        }
        else {
            *dest++ = *src++; // copy not punctuation character
        }
    }

    *dest = 0;
}

int main()
{
    char str[] = "C@ C++, Java: (Python) C#$ Go! <Rust>";

    printf("len = %zu\n", strlen(str));

    remove_punctuation_from_string(str);

    printf("str = %s\n", str);
    printf("len = %zu\n", strlen(str));

    return 0;
}



/*
run:

len = 37
str = C C Java Python C Go Rust
len = 25

*/

 

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