C语言面试C++字符串替换空格示例

#include<stdio.h>
#include<assert.h>
#include<string.h>
char* replace(char* parr, const char* e1, const char* e2)
{
	assert(e1 && e2);
	char arr2[100] = { 0 };//创建一个数组用来存改变后的字符串
	unsigned int len = strlen(parr);
	unsigned int len1 = strlen(e1);
	unsigned int len2 = strlen(e2);
	int i = 0;//用来跟踪parr
	int j = 0;//用来跟踪arr2
	int z = 0;//用来跟踪e2
	for (i = 0; i < len; i++)
	{
		if (parr[i] != *e1)
		{
			arr2[j++] = *(parr+i);
		}
		else
		{
			for (z = 0; z < len2; z++)
			{
				arr2[j++] = *(e2 + z);
			}
		}
	}
	return arr2;
}


int main()
{
	char arr[100] = { 0 };//给足空间
	while (1)
	{
		printf("请输入原字符串:>");
		gets(arr);
		printf("改变后的字符串为:>%s\n", replace(arr, " ", "%20"));
	}
	return 0;
}