如题所述
输入文件input.dat内容为:(数字以空格或换行符隔开)
运行程序后,输出文件output.dat内容为:
可见实现了数字从大到小排列
C语言源代码为:
#include <stdio.h>
#include <stdlib.h>
#define N 100
int cmp(const void *a, const void *b) {
return *(int *)b - *(int *)a;
}
int main() {
int arr[N], n = 0;
FILE *fin = fopen("input.dat", "r");
for (n = 0; n < N; ++n) {
if (fscanf(fin, "%d", &arr[n]) == EOF)
break;
}
qsort(arr, n, sizeof(int), cmp);
FILE *fout = fopen("output.dat", "w");
for (int i = 0; i < n; ++i)
fprintf(fout, "%d ", arr[i]);
fprintf(fout, "\n");
fclose(fin);
fclose(fout);
return 0;
}
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