用C连接两个字符串

#define MAXSTRLEN 255
#define TRUE 1
#define FALSE 0
typedef struct
{
char str[MAXSTRLEN];
int len;
}s_string;
int concat(s_string *s1, s_string *s2, s_string *t)
{

}
void main()
{
s_string *s,*t,*r;
clrscr();
s=(s_string *)malloc(sizeof(s_string));
t=(s_string *)malloc(sizeof(s_string));
r=(s_string *)malloc(sizeof(s_string));
gets(s->str);
gets(t->str);
s->len=strlen(s->str);
t->len=strlen(t->str);
if(!concat(s,t,r)) printf("the string is cut!\n");
else printf("the string is uncut.\n");
printf("%s\n",r->str);
}

好久不玩这个了：下面纯手工编写， 没有测试， 你可以测试一下看看。

int concat(s_string *s1, s_string *s2, s_string *t)
{
int totalLength = 0 ;
int temp = 0 ;
int i=0;
int retValue = 0;
totalLength = s1->len + s2->len
if totalLength > sizeof(t) {retValue = 1}
if s1->len > sizeof(t) -1 || s2->len > sizeof(t)-1 {retValu = 2; return retValue;}

for(i=0;ilen;i++)
{
t->str[i] = s1->str[i];
}

if retValue ==0
{
for (i=s1->len;ilen+s2->len;i++)
{
t->str[i]=s2->str[i-s1->len]
}
}
else
{
for (i=s1->len;i {
t->str[i] = s2->str[i-s1->len]
}
}

t->str[i] = '\0'
return retValue;
}

#include #include #include int main(void) { char string1[20],string2[20],string3[40]; int len1,len2,i = 0,j=0; printf("输入第一个字符串！："); gets(string1); printf("输入第二个字符串！："); gets(string2); len1 = strlen(string1); len2 = strlen(string2); string1[len1-1] = ‘\0’; string1[len2-1] = ‘\0’; while(string1[i]!='\0'&&string2[i]!='\0') { string3[j++] = string1[i]; string3[j++] = string2[i]; i++; } if(string1[i] == '\0') { while(string2[i]!='\0') { string3[j++] = string2[i]; i++; } } if(string2[i] == '\0') { while(string1[i]!='\0') { string3[j++] = string1[i]; i++; } } string3[i] = '\0'; printf("%s\n",string3); return 0; }