Question

缓冲区中的文字：

Source$1
Destination$5

代码：

char buffer[50];
int start = 0;
int dest = 0;
FILE * infile = fopen(argv[1], "r")

fgets(buffer, sizeof(buffer), infile);
sscanf(buffer, "Source$%d", &start); 
printf("start: %d \n", start);
fgets(buffer, sizeof(buffer), infile);
sscanf(buffer, "Destination$%d", &dest);
printf("destination: %d \n", dest);

输出：

start: 0
destination: 5

目的地是正确的号码，开始不是。我该如何解决这个问题？

Answer 1

我发布的代码中没有任何错误。最好添加代码来执行错误检查。然后你可以看到问题所在。

if ( fgets(buffer, sizeof(buffer), infile) )
{
   printf("%s", buffer);
   if ( sscanf(buffer, "Source$%d", &start) == 1 )
   {
      printf("start: %d \n", start);
   }
   else
   {
      printf("Unable to read source from buffer\n");
   }
}
else
{
   printf("Unable to read the text for source\n");
}


if ( fgets(buffer, sizeof(buffer), infile) )
{
   printf("%s", buffer);
   if ( sscanf(buffer, "Destination$%d", &dest) == 1 )
   {
      printf("destination: %d \n", dest);
   }
   else
   {
      printf("Unable to read destination from buffer\n");
   }
}
else
{
   printf("Unable to read the text for destination\n");
}

正确使用sscanf来解析字符串c ++

1 个答案: