c中的警告称为“在此函数中未初始化使用's1'和's2'”[重复]

Question

无法解决c中调用s1 s2 is used uninitialized this function的警告

int main()
{
    char *s1, *s2;
    printf("Please enter string s1 and then s2:\n");
    scanf("%s %s", s1, s2);
    printf("%s %s", *s1, *s2);
return 0;
}

Answer 1

你必须为s1和s2分配：

// do not forget to include the library <stdlib.h> for malloc function
s1 = malloc(20); // string length of s1 ups to 19;
if(!s1) {return -1;}
s2 = malloc(20) // // string length of s2 ups to 19 also;
if(!s2) {return -1;}

scanf函数中的，应该改成(Disadvantages of scanf)：

scanf("%19s %19s", s1, s2); // or using fgets

或者你可以使用字符数组代替指针：

char s1[20], s2[20];
// Or you can define a maximum length MAX_LEN, then using:
// char s1[MAX_LEN], s2[MAX_LEN];