Converting inches to centrimetres

Question

I've wrote this simple program which converts inches to centimetres but the float gives me some huge numbers after the decimal place. I want it to look more like for example 25.78 rather than 25.780000 or something. What should I change to make it look like that? Here is the program:

#include <stdio.h>

int main()
{
    float inches, centimeters;

    printf("Enter a number of inches to be converted: ");
    scanf(" %f", &inches);

    centimeters = inches * 2.54;        // 1 inch = 2.54cm

    printf("%f is equalled to %fcm\n",inches, centimeters);

    return 0;
}

possible duplicate of [C: printf a float value](http://stackoverflow.com/questions/8345581/c-printf-a-float-value) — Not Amused, Mar 26 '14 at 16:14
More info about formating strings in C: http://www.codingunit.com/printf-format-specifiers-format-conversions-and-formatted-output — adripanico, Mar 26 '14 at 16:15
@user2938819 - There are several good answers below. if you see one that works for you, acknowledge it by clicking the hollow check mark or an up arrow. — ryyker, Mar 26 '14 at 16:28

haccks · Answer 1 · 2014-03-26T16:22:24.857

2

Use %.2f in your printf.

printf("%.2f is equalled to %.2fcm\n",inches, centimeters);

and must read Basics of Formatted Input/Output in C.

edited Mar 26 '14 at 16:22

answered Mar 26 '14 at 16:13

haccks

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score 2 · Answer 2 · answered Mar 26 '14 at 16:13

2

Add a precision to your format specifier in printf:

printf("%.2f is equalled to %.2f cm\n", inches, centimeters);

%.2f means your value will have a precision of 2 places after the decimal point.

answered Mar 26 '14 at 16:13

Hunter McMillen

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score 2 · Answer 3 · answered Mar 26 '14 at 16:13

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Change the format a bit - instead of using "%f" use ".2%f.

Like

//-------vv------ and -------vv-----------------------------
printf("%.2f is equalled to %.2fcm\n",inches, centimeters);
//-------^^------------------^^-----------------------------

answered Mar 26 '14 at 16:13

Kiril Kirov

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score 2 · Answer 4 · answered Mar 26 '14 at 16:13

2

printf("%.2f", myFloat); 2 represents number of digits after decimal point

answered Mar 26 '14 at 16:13

Not Amused

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score 2 · Answer 5 · answered Mar 26 '14 at 16:13

2

printf("%f is equalled to %.2fcm\n",inches, centimeters);

Note the extra %.2f

answered Mar 26 '14 at 16:13

Evdzhan Mustafa

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score 1 · Answer 6 · answered Mar 26 '14 at 16:38

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printf("%f is equalled to %.2fcm\n",inches, centimeters);

U can write %.2f if u need the precision to be 2.

Read these articles: http://www.cplusplus.com/reference/cstdio/printf/

http://www.cs.fsu.edu/~myers/c++/notes/c_io.html

answered Mar 26 '14 at 16:38

Sabbarish

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Converting inches to centrimetres

6 Answers6