I have a c++ language beginner question.

Even if you enter numbers that do not fall apart by dividing them into 10 and 4, the decimal point does not come out properly. How can I get a decimal point? ㅠ<

    int a,b,c;
    printf ("Please enter a number to calculate."\n");
    scanf("%d %d",&a,&b);
    printf ("plus = 1 minus = 2 multiplied = 3 divided = 4\n");
    scanf("%d",&c);
    if (c==1)
        printf("%.3f",(a+b)*1.0);
    else if (c==2)
        printf("%.3f",(a-b)*1.0);
    else if (c==3)
        printf("%.3f",(a*b)*1.0);
    else 
        printf("%.3f",(a/b)*1.0);
    return 0;

Below is the execution screen

c++ calculator

2022-09-20 15:07

1 Answers

The result of the operation between two integers is an integer.

Like (double)a/b, if you accidentally convert the value of a and divide it by b, it is a real number/integer, so the result is a real number.

Please refer to the code below.

#include <stdio.h>

int main()
{
    int a, b, c;
    printf ("Please enter a number to calculate."\n");
    scanf("%d %d", &a, &b);
    printf ("plus = 1 minus = 2 multiplied = 3 divided = 4\n");
    scanf("%d", &c);
    if (c == 1)
        printf("%.3f", (double)a + b);
    else if (c == 2)
        printf("%.3f", (double)a - b);
    else if (c == 3)
        printf("%.3f", (double)a * b);
    else
        printf("%.3f", (double)a / b);
    return 0;
}

2022-09-20 15:07

If you have any answers or tips

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