c中有问题，字符串createLabel()功能出错 [英] there is some problem in c and error on string createLabel() fuction

问题描述

#include <string.h>
#include <stdlib.h> // for itoa() call
#include <stdio.h>

static int labelCount = 0;

void main()
{
    string Label = createLabel();
    printf("%s\n", Label);
}

string createLabel()
{
    string buf = "";
    string lbl = "L";
    labelCount++;
    // Convert int to string [buf]
    itoa(labelCount, buf, 10);
    strcat(lbl, buf);
    return lbl;
}

推荐答案

不，那只是您对文档的阅读(以及c/c ++代码的混合)

您不能在这些函数中使用string数据类型.这些函数旨在与C样式的以null终止的字符串(字符数组，以NULL终止)一起使用.

在这里''去:

Nah, it''s just your reading of the documentation (and mixing of c/c++ code)

You can''t use the string datatype with these functions. These functions are designed to work with C-style null-terminated strings (arrays of chars, terminated with a NULL)

Here ''go:

#include <string.h>
#include <stdlib.h> // for itoa() call
#include <stdio.h>

static int labelCount = 0;

char *createLabel()
{
    char buffer[16];
    char *result;

    labelCount++;
    sprintf(buffer, "L%d", labelCount);
    result = strdup(buffer);
    return result;
}

int main()
{
    char *Label;
    Label = createLabel();
    printf("%s\n", Label);
    free(Label);            // free memory allocated in call to strdup
    return 0;
}

这篇关于c中有问题，字符串createLabel()功能出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！