When a variable is not initialized in main function it contains garbage value. This can be well seen from the example below
main()
{
int x;
printf( “%d”,x);
z= sample()
}
sample()
{
printf(“Testing program”);
}
Output is
x=80
Testing program
The above program prints a garbage value and the output testing program .This is because the variable x is not initialized and so the variable x had garbage value which is printed first then the function sample is called which gave output as testing program. Thus it is essential to initialize variables in main () function.
What happens when a variable is not initialized in main function?
When a variable is not initialized in main function it contains garbage value. This can be well seen from the example below
Output is
The above program prints a garbage value and the output testing program .This is because the variable x is not initialized and so the variable x had garbage value which is printed first then the function sample is called which gave output as testing program. Thus it is essential to initialize variables in main () function.
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