CateDoge - 1 year ago 55

C Question

`#include <stdio.h>`

#include <stdlib.h>

#include <math.h>

#define PI 3.14159

/* give you the diameter , circumference and area */

int main()

{

float radius, area, circumference, diameter ;

printf( "\nI will calculate the diameter, area and circumference.\n" );

printf( "\nPlease enter a circle's radius: \n" );

scanf( "%f", &radius );

diameter = 2 * radius ; // diameter is 2 times radius

area = PI * pow ( radius, 2 ) ;

circumference = 2 * PI * radius

printf( "\nThe diameter is %d.\n", diameter );

printf( "\nThe circumference is %f.\n", circumference );

printf( "\nThe area is %f.\n", area );

printf( "\nThanks! See you next time!\n" );

return 0;

}

Answer Source

The `;`

at the end of an expression acts as a [ sequence point ] in `C`

, The following statement

```
circumference = 2 * PI * radius // Missing semicolon at the end
```

missed the `;`

at the end

Also, use `%f`

format specifier for float with some precision information, eg

```
printf( "\nThe diameter is %d.\n", diameter );
```

should be

```
printf( "\nThe diameter is %0.2f.\n", diameter);
```

The `.2`

before `f`

sets the precision to 2 places after the decimal point.