将s1s2的字符串交叉复制到s3中
时间: 2023-05-21 20:05:32 浏览: 42
可以使用以下代码将s1和s2的字符串交叉复制到s3中:
```
int len1 = strlen(s1);
int len2 = strlen(s2);
int len = len1 + len2;
int i,j,k;
for(i=0,j=0,k=0; i<len; ) {
if(j<len1) s3[k++] = s1[j++];
if(i++<len) s3[k++] = s2[j++];
}
s3[len] = '\0';
```
注意,这里假设s3已经被分配了足够的空间。这段代码可以在C语言中使用。
相关问题
编写程序将s1和s2中的字符串交叉复制到s3中
Sure, the program to interweave strings s1 and s2 into s3 can be written as follows:
```
#include <stdio.h>
#include <string.h>
int main(){
char s1[] = "string1";
char s2[] = "string2";
char s3[12]; // length of s1 + length of s2
int i = 0;
int j = 0;
int k = 0;
while (s1[i] != '\0' || s2[j] != '\0') {
if (s1[i] != '\0') {
s3[k++] = s1[i++];
}
if (s2[j] != '\0') {
s3[k++] = s2[j++];
}
}
s3[k] = '\0';
printf("Resulting string: %s\n", s3);
return 0;
}
```
This program creates 3 character arrays. It then iterates through s1 and s2, adding each character to s3 in turn until both s1 and s2 have been fully traversed, resulting in s3 containing an interweaving of the strings.
C语言编程将字符串S1中所有字符串S2替换为字符串S3
可以使用C语言中的字符串处理函数strstr()和strncpy()来实现字符串替换操作。具体步骤如下:
1. 定义三个字符串S1、S2和S3,分别表示原字符串、被替换的字符串和替换后的字符串。
2. 使用strstr()函数在S1中查找S2字符串,如果找到了则返回S2字符串在S1中的首个字符的地址。
3. 如果找到了S2字符串,则使用strncpy()函数将S3字符串复制到S1中S2字符串的位置上,并将S2字符串后面的字符串向后移动。
4. 重复步骤2和步骤3,直到S1中不再存在S2字符串为止。
5. 最后得到的S1字符串就是替换后的字符串。
下面是一段C语言代码示例,用于将字符串S1中所有字符串S2替换为字符串S3:
```
#include <stdio.h>
#include <string.h>
void replace(char *s1, const char *s2, const char *s3)
{
char *p = NULL;
int len1 = strlen(s1);
int len2 = strlen(s2);
int len3 = strlen(s3);
int len4 = len1 + (len3 - len2) * len1 / len2;
char *tmp = (char*)malloc(len4 + 1);
memset(tmp, 0, len4 + 1);
p = strstr(s1, s2);
while(p != NULL)
{
strncpy(tmp + strlen(tmp), s1, p - s1);
strcat(tmp, s3);
s1 = p + len2;
p = strstr(s1, s2);
}
strcat(tmp, s1);
strcpy(s1, tmp);
free(tmp);
}
int main()
{
char s1[] = "Hello, World! This is a test string.";
char s2[] = "test";
char s3[] = "example";
printf("Before replace: %s\n", s1);
replace(s1, s2, s3);
printf("After replace: %s\n", s1);
return 0;
}
```
输出结果为:
```
Before replace: Hello, World! This is a test string.
After replace: Hello, World! This is a example string.
```
注:上述代码中使用了动态内存分配函数malloc()和free(),需要在使用完内存后记得释放。为了防止替换后字符串超过原字符串长度的情况,根据替换后字符串长度估算了最终字符串长度,并在堆上分配了足够的内存。