In C language, access uninitialized integer and floating-point variables

Question

Declaring uninitialized int and float variables in C and trying to print their values. Explain what will happen.

Solution

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

• Whenever we declare a variable, a location is assigned to the variable. The only problem is that, by initializing, we are trying to occupy a memory location that was already allocated at declaration time.

• But in the following program, we have not initialized the value in the reserved memory location. However, by default these locations are occupied by 0 or garbage values. When we try to print it shows 0 or garbage value as output.

Example

The following is a C program to access int and float variables-

Live Demo

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

Output

When the above program is executed, the following results will be produced-

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

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