Accessing variables of Int and Float without initializing in C

Problem

Declare int and float variables without initializing and try to print their values in C language. Explain what will happen.

Solution

• If a variable is declared but not initialized or uninitialized and if those variables are trying to print, then, it will return 0 or some garbage value.

• Whenever we declare a variable, a location is allocated to that variable. The only thing is with the help of initialization, we are trying to occupy the memory location which is already allotted while declaration.

• But in the below program, we are not initializing the values in the memory locations which are reserved. But, by default, the locations are occupied with 0 or garbage values. When we are trying to print it displays 0 or garbage value as output.

Example

Following is the C program for accessing variables in int and float −

#include<stdio.h>
int main(){
   float a,b,c;
   int x,y,z;
   printf("value of a:%f\n",a);
   printf("value of b:%f\n",b);
   printf("value of c:%f\n",c);
   printf("value of x:%d\n",x);
   printf("value of y:%d\n",y);
   printf("value of z:%d",z);
   return 0;
}

Output

When the above program is executed, it produces the following result −

value of a:0.000000
value of b:0.000000
value of c:0.000000
value of x:1512368
value of y:0
value of z:27