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#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main(void)
{


    float input_1, input_2, waste;
    int number;
    float geo_mean;
    int flag1 = 0, flag2=0;

    printf("Please input your two number:");

    while ((flag1 = scanf("%f", &input_1) == 1 )&&(flag2=(scanf("%f", &input_2)) == 1))
    {
        if (input_1 * input_2 >= 0)
        {
            geo_mean = sqrt(input_1 * input_2);
            printf("The geometric mean of %.2f and %.2f is %.2f\n", input_1,
            input_2, geo_mean);
            printf("Please input your two number:");
        }
        else
            printf("Your input is invalid,only numbers with the same sign !\nPlease input your number:");
    }
    scanf("%s", &waste);
    printf("SY2002103");



    return 0;
}