Question

How to remove leading zeros from a string in C

Answer 1

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

void removeLeadingZeros(char *str) {
    int i = 0, j = 0;
    int len = strlen(str);

    // Find the index of the first non-zero character
    while (i < len && str[i] == '0') {
        i++;
    }

    // Shift all characters to the left
    while (i < len) {
        str[j++] = str[i++];
    }
    str[j] = '\0'; 

    // If the string was all zeros
    if (j == 0) {
        str[0] = '\0';
    }
}

int main() {
    char str[] = "000345865.9301";
    
    removeLeadingZeros(str);
    
    printf("%s\n", str);
    
    return 0;
}



/*
run:

345865.9301

*/

 

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