[英]Why aren't my variables being saved? I've been testing this code and my variables aren't being saved into my struct array
Here's my code and output of my variables: What else do I need to add to my while loop so that I can have my variables and methods work. 这是我的代码和变量的输出:我还需要添加其他内容到while循环中,以使变量和方法正常工作。
int main() {
FILE *ifp;
ifp = fopen("processes.txt","r");
if(ifp == NULL) {
printf("Error Opening file.\n");
exit(1);
}
char str[100];
int i=0;
while(fgets(str, 100, ifp) != NULL) {
fscanf(ifp," %d %0.1f %d %d", &arr[i].pid, &arr[i].AT, &arr[i].duration, &arr[i].rank);
i++;
}
}
printf("ProceId AT duration rank\n");
for (int j = 0; j < i - 1; ++j){
printf("%d\t%0.1f\t%d\t%d\n",arr[j].pid,arr[j].AT,arr[j].duration,arr[j].rank );
}
ProceId AT duration rank
1398 0.0 0 0
2306 0.0 0 0
3219 0.0 0 0
4478 0.0 0 0
5653 0.0 0 0
6399 0.0 0 0
7777 0.0 0 0
Here is the file which has a line of strings that i don't need which is why i used fgets. 这是有一行不需要的字符串的文件,这就是为什么我使用fgets的原因。
ProcessID ArrTime Duration Rank
1398 1.0 16 3
2306 4.5 6 7
3219 3.0 11 1
4478 2.0 3 5
5653 3.5 7 2
6399 4.0 8 6
7777 2.5 17 8
Change this: 更改此:
fscanf(ifp," %d %0.1f %d %d", &arr[i].pid, &arr[i].AT, &arr[i].duration, &arr[i].rank);
to this: 对此:
fscanf(ifp," %d %f %d %d", &arr[i].pid, &arr[i].AT, &arr[i].duration, &arr[i].rank);
since you were using an invalid conversion specifier. 因为您使用的是无效的转换说明符。
Pay attention to the compiler warnings next time, they usually tell the whole story: 下次要注意编译器警告,它们通常会讲述整个故事:
warning: invalid conversion specifier '.'
[-Wformat-invalid-specifier]
fscanf(ifp," %d %0.1f %d %d", &arr[i].pid, &arr[i].AT, &arr[i].d...
~~~^
warning: format specifies type 'int *' but the argument has type
'float *' [-Wformat]
fscanf(ifp," %d %0.1f %d %d", &arr[i].pid, &arr[i].AT, &arr[i].d...
~~ ^~~~~~~~~~
%f
warning: data argument not used by format string
[-Wformat-extra-args]
..." %d %0.1f %d %d", &arr[i].pid, &arr[i].AT, &arr[i].duration, &arr[i].ra...
~~~~~~~~~~~~~~~~~ ^
The warnings suggest that because of the invalid conversion specifier, the %d
format specifier is used for the float field of your struct (named AT
), and then everything becomes a mess, since you are short by one format specifier... 警告提示由于无效的转换说明符,
%d
格式说明符用于结构体的float字段(名为AT
),然后一切都变得一团糟,因为您缺少一个格式说明符...
Read more in How to only accept a certain precision (so many decimals places) in scanf? 在如何仅在scanf中接受某个精度(这么多小数位)中阅读更多内容。
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