[已解决]C

ChenTaicheng

请问一下在ubuntu14.04上出现了一下报错信息是什么情况？
代码和报错信息如下：

1. #include <stdio.h>
   
2. 
   
3. int main()
   
4. {
   
5.         int i;
   
6.         char j;
   
7.         float k;
   
8. 
   
9.         i = 123;
   
10.         j = 'C';
    
11.         k = 3.14;
    
12. 
    
13.         printf("size of int is %d\n", sizeof(int));
    
14.         printf("size of i is %d\n", sizeof(i));
    
15.         printf("size of char is %d\n", sizeof(char));
    
16.         printf("size of j is %d\n", sizeof j);
    
17.         printf("size of float is %d\n", sizeof(float));
    
18.         printf("size of k is %d\n", sizeof k);
    
19. 
    
20.         return 0;
    
21. }
    

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在LINUX下运行报错信息如下：
root@tc:~/C/s1e6# gcc work1.c -o work1
work1.c: In function ‘main’:
work1.c:12:2: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  printf("size of int is %d\n",sizeof(int));
  ^
work1.c:13:2: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  printf("size of i is %d\n",sizeof(i));
  ^
work1.c:14:2: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  printf("size of char is %d\n",sizeof(char));
  ^
work1.c:15:2: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  printf("size of j is %d\n",sizeof(j));
  ^
work1.c:16:2: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  printf("size of float is %d\n",sizeof(float));
  ^
work1.c:17:2: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  printf("size of k is %d\n",sizeof k);
  ^

最佳答案

月排行榜 / 总排行榜

超凡天赐

2017-5-18 18:28:22

提示就是让你把类型改为无符号长整型。
我认为你这个只是警告。我猜和国际标准有关。你可以查一下c99和c11标准。下面代码应该不会警告。

1. #include <stdio.h>
   
2. int main()
   
3. {
   
4.     int i;
   
5.     char j;
   
6.     float k;
   
7.     i = 123;
   
8.     j = 'C';
   
9.     k = 3.14;
   
10.     printf("size of int is %lu\n", sizeof(int));
    
11.     printf("size of i is %lu\n", sizeof(i));
    
12.     printf("size of char is %lu\n", sizeof(char));
    
13.     printf("size of j is %lu\n", sizeof j);
    
14.     printf("size of float is %lu\n", sizeof(float));
    
15.     printf("size of k is %lu\n", sizeof k);
    
16.     return 0;
    
17. }
    

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跳转到最佳答案楼层

超凡天赐

提示就是让你把类型改为无符号长整型。
我认为你这个只是警告。我猜和国际标准有关。你可以查一下c99和c11标准。下面代码应该不会警告。

1. #include <stdio.h>
   
2. int main()
   
3. {
   
4.     int i;
   
5.     char j;
   
6.     float k;
   
7.     i = 123;
   
8.     j = 'C';
   
9.     k = 3.14;
   
10.     printf("size of int is %lu\n", sizeof(int));
    
11.     printf("size of i is %lu\n", sizeof(i));
    
12.     printf("size of char is %lu\n", sizeof(char));
    
13.     printf("size of j is %lu\n", sizeof j);
    
14.     printf("size of float is %lu\n", sizeof(float));
    
15.     printf("size of k is %lu\n", sizeof k);
    
16.     return 0;
    
17. }
    

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