C语言程序从键盘上输入两个字符串若不相等将短的字符串连接到长的字符串的末尾并

C语言程序从键盘上输入两个字符串若不相等将短的字符串连接到长的字符串的末尾并

#include"stdio.h"
#include "string.h"
void main()
{
char s1[50];
char s2[50];
scanf("%s",s1);
scanf("%s",s2);
if(strcmp(s1,s2))
{
if(strlen(s1)>strlen(s1))
strcat(s1,s2);
else
strcat(s2,s1);
puts(s1);
}
else
puts("相同");
}

#include
int main()
{
char a[100];
char b[100];
int i;
int j;
int len_a;
int len_b;

printf("input string a:\n");
gets(a);

printf("input string b:\n");
gets(b);

len_a = 0;
while(a[len_a])
{
len_a++;
}
len_b = 0;
while(b[len_b])
{
len_b++;
}
if(len_a>len_b)
{
i = len_a;
j = 0;
while(b[j])
{
a[i] = b[j];
i++;
j++;
}
a[i] = '\0';
printf("string a is longer than string b:\n");
printf("%s\n",a);
}
if(len_a {
i = 0;
j = len_b;
while(a[i])
{
b[j] = a[i];
i++;
j++;
}
b[j] = '\0';
printf("string b is longer than string a:\n");
printf("%s\n",b);
}
return 0;
}
运行效果：
C:\Documents and Settings\Owner\桌面>test.exe
input string a:
kjlasdjlafuiw3hj3k4
input string b:
56sfd6a
string a is longer than string b:
kjlasdjlafuiw3hj3k456sfd6a
C:\Documents and Settings\Owner\桌面>