On what does size of data types depend?

Hi all,

I am using gcc compiler in linux.I compiled a small program
int main()
{
printf("char : %d\n",sizeof(char));
printf("unsigned char : %d\n",sizeof(unsigned char));
printf("short : %d\n",sizeof(short));
printf("unsigned short : %d\n",sizeof(unsigned short));
printf("int : %d\n",sizeof(int));
printf("unsigned int : %d\n",sizeof(unsigned int));
printf("long : %d\n",sizeof(long));
printf("unsigned long : %d\n",sizeof(unsigned long));
printf("long long : %d\n",sizeof(long long));
printf("unsigned long long : %d\n",sizeof(unsigned long
long));
}

Result was

char : 1
unsigned char : 1
short : 2
unsigned short : 2
int : 4
unsigned int : 4
long : 4
unsigned long : 4
long long : 8
unsigned long long : 8


What i want to know is what will be the effect if i use int in
place of long in applications running on linux and also on what factors
does the size of datatypes depend.

Thanks
Sunil.

.

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