从命令行参数打印子字符串,在C中

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

int main(int argc, char *argv[]) {
    if (argc < 3) {
        printf("Usage: %s<string><start_index> <end_index>\n", argv[0]);
        return 1;
    }

    const char *str = argv[1];
    int start_index = atoi(argv[2]);
    int end_index = atoi(argv[3]);

    if (start_index < 0 || end_index >= strlen(str) || start_index > end_index) {
        printf("Invalid indices.\n");
        return 1;
    }

    for (int i = start_index; i <= end_index; i++) {
        printf("%c", str[i]);
    }
    printf("\n");

    return 0;
}