4
Number=4
The scanf() function is used to take input from user. In this program, the user is asked a input and value is stored in variable c. Note the '&' sign before c. &c denotes the address of c and value is stored in that address.
I/O of floats in C
#include <stdio.h>
int main(){
float a;
printf("Enter value: ");
scanf("%f",&a);
printf("Value=%f",a); //%f is used for floats instead of %d
return 0;
}