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    printf("?\t");
    scanf("%f",&num);
    while(num != -1)
    {       
        if(num == -1)
        {
            break;
        }
        else
        {
            printf("?\t");
            scanf("%f",&num);
            average += num;
            count = count + 1;
        }
    }
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char *ctime(const time_t *clock);
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/// Sets the value for a small integer column.
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#include <stdio.h>
int main()
{
 int i = 0;
 clock_t start_time, end_time;
 start_time = clock(); //¿ªÊ¼¼Æʱ, start_time = 0
 
 while( ......
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