how to keep decimals in c

问题

I am writing simple code for homework. I get one number from user, which is 3.4, when I define it with

scanf("%d",&a)

it takes only 3 and do it that way. I defined a as

int a;

What should I do?

回答1:

Use float

float a;
scanf("%f", &a);

回答2:

I think you are very new to c programming. This is a very simple job. This can be done as:-

float a;
// to input a data in the variable a
scanf("%f",&a);
//to display the stored data
printf("%f\n",a);
//or 
printf("%.nf\n",a);//specify value of n
//maximum value of n is 6 also is its default value
//for e.g. printf("%.2f",a); will display decimal number upto two digits after the decimal place
//you can know more about displaying data as
%d: decimal value (int) 
%c: character (char) 
%s: string (const char *) 
%u: unsigned decimal value (unsigned int) 
%ld: long int (long) 
%f: float value (float or double) 
%x: decimal value in Hexadecimal format 
%o: decimal value in octal format

For avialabe list of formatting specifications go here

回答3:

%d is for int. 3.4 is not an int type, you can use float.

float x;
scanf("%f", &x);

For detailed information about data types, you can check here: http://en.wikipedia.org/wiki/C_data_types

And also here: http://www.techonthenet.com/c_language/variables/index.php

回答4:

You should define a as

float a;

and replace %d with %f in scanf

scanf("%f", &a);

What should I do?

Read Basics of Formatted Input/Output in C.

回答5:

Its very simple for int variable we use %d format specifier and if we want float we use %f format specifier. Because according to IEEE int and float bit map format are different.

回答6:

You are declaring int a which can take only integer value so what you have to do is make it float which is used for numbers having decimal point

float a; scanf(%f,&a);

来源：https://stackoverflow.com/questions/19078805/how-to-keep-decimals-in-c

标签

decimal