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ÔÚtime.hÍ·ÎļþÖУ¬¶¨ÒåÁË typedef long clock_t
clock()ÊÇÓÃÀ´¼ÆËãÁ½¸öʱ¼äµãÖ®¼äµÄʱ¼ä¼ä¸ô¡£ÈçϳÌÐò£º
#include <stdio.h>
int main()
{
 int i = 0;
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[ 6.3.2.3-3] An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant.
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#include <string.h>
#include <math.h>
#define BASE 10
int intlen(long n);
int main()
{
int i, j, num, sz;
i = j = num = sz = 0;
if (!scanf("%d", &num) || num <= 0) {
printf("invalid input\n");
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