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function_test 0627

判断素数?

#define _CRT_SECURE_NO_WARNINGS 1 
#include<math.h>
int is_prime(int x)
{
int j = 0;
for (j = 2; j<=sqrt(x); j++)
{
if (x%j == 0)
return 0;
}
return 1;
}
int main()
{
int i = 0;
for (i = 100; i <= 200; i++)
{
if (is_prime(i) == 1)
printf("%d ", i);
}
return 0;
}

判断闰年?

1year==365天5‘48’‘46’‘’  0.2422       4  ~ 0.9688

400 ~ 96.88  97    100 200 300

int is_leap_year(x)
{
if (x % 4 == 0 && x % 100 != 0 || x % 400 == 0)
return 1;
else
return 0;
}
int main()
{
int i=0;
int count = 0;
for (i = 1000; i <= 2000; i++)
{
if (1 == is_leap_year(i))
printf("%d ", i);
count++;
}
printf("\n%d ", count);
return 0;
}


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