C 中的连接

Question

我如何编写函数:

a) 对字符串的长度求和(并打印)，并在附加两个字符串之前检查字符串的总和是否小于 70(如果大于 70，则会出现空消息)

b) 在这种情况下如何使用 fgets？

c)我还尝试打印出原始的两个字符串和组合字符串。

这是我到目前为止所拥有的..但我对如何继续感到困惑？？？

#include <stdio.h>
#include <string.h>

int main()
{
   char a[70], b[50];

   printf("Enter the first string\n");
   gets(a);

   printf("Enter the second string\n");
   gets(b);

   strcat(a,b);

   printf("String obtained on concatenation is %s\n",a);

Answer 1

#include <stdio.h>
#include <string.h>

#define BUFFERSIZE 1024

int main() {

 char buffer_a[BUFFERSIZE];
 char buffer_b[BUFFERSIZE];
 char *concat;

 printf("Enter the first string: \n");
 if(fgets(buffer_a, BUFFERSIZE, stdin)){
   char *p = strchr(buffer_a, '\n');
   if (p){
     *p = '\0';
   }
 }
 printf("Enter the second string: \n");
 if(fgets(buffer_b, BUFFERSIZE, stdin)){
   char *p = strchr(buffer_b, '\n');
   if (p){
     *p = '\0';
   }
 }

 int len_a = strlen(buffer_a);
 int len_b = strlen(buffer_b);
 int len_both = (len_a + len_b);

 printf("First string: %s", buffer_a);
 printf("Length of first string: %i\n", len_a);
 printf("Second string: %s", buffer_b);
 printf("Length of second string: %i\n", len_b);

 if(len_both < 70){
   concat = strcat(buffer_a,buffer_b);
   printf("Concatenated string: %s\n", concat);
 } else{
   printf("Length of combined strings > 70\n");
 }

 return 0;

}