[英]Reading and adding integers read from a file in C
So I've read a lot of similar posts but I can't nail down what my issue is here. 所以我读过很多类似的文章,但是我无法确定我的问题在这里。
{
FILE * fp;
fp = fopen("integer_store.txt", "r");
int total;
int i;
clock_t start, end;
double time;
start = clock();
fscanf(fp, "%d", &i);
while(!feof(fp)) {
fscanf(fp, "%d", &i);
total = total + i;
}
end = clock();
time = ((double)(end-start)) / CLOCKS_PER_SEC;
printf("Total: %d\n",total);
printf("Execution time: %f seconds \n",time);
fclose(fp);
}
The goal is to print a total of all the numbers in a file of ASCII numbers separated by spaces... everything seems to work except every time I run it i get a different total for the same file. 目标是将所有数字的总和打印在一个用空格分隔的ASCII数字文件中……一切似乎都可以正常工作,除了每次运行它时,对于同一个文件我都会得到不同的总数。
Please initialize the variable total
like int total = 0;
请初始化变量
total
例如int total = 0;
first. 第一。
Moreover, you should check if fopen
succeeded ( fp
is not NULL
). 此外,您应该检查
fopen
成功( fp
不是NULL
)。
您永远不会初始化total
所以您要增加随机内存。
total
is not initialized to 0. total
未初始化为0。
Try this declaration: 试试这个声明:
int total = 0;
Just to add to the explanation, in C and C++, any variable that has not been initialized DOES actually have a value, and that value is random. 只是为了补充说明,在C和C ++中,任何尚未初始化的变量DOES实际上都有一个值,并且该值是随机的。 This is why every time you ran the program, you would get a different result.
这就是为什么每次运行该程序都会得到不同的结果的原因。
Check this out if you want more of an explanation: https://en.wikipedia.org/wiki/Uninitialized_variable 如果需要更多说明,请查看此: https : //en.wikipedia.org/wiki/Uninitialized_variable
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