Question

to ask user to input a float number, then round it up to the second digit 4. Write a C program after decimal point and output it. (6 points)

Answer 1

#include<stdio.h>

// round to 2 decimal places

float _round(float x)

{

    // 36.66666 * 100 =3666.66

    // 0.5 is added for rounding off value

    // then type cast to int to convert to nearest integer

    float ans = (int)(x * 100 + .5);

   

    // then divided by 100

    return (float)ans / 100;

}

int main()

{

    float x;

   

    printf("Enter a float number : ");

   

    // get user input

    scanf("%f", &x);

   

    // print digit upto 2 decimal places

    printf("%f", _round(x));

   

   return 0;

}

Sample Output

a float number : 2.3657 2.370000