How do we find out weather the machine is 64bit or 32bit programmatically?

Question

I need a program to find out weather the machine is 64bit or 32bit programmatically it can be in C

Answer 1

i'm not sure but let's try with u!
#include
int main(void){
printf("Lets' check");
printf("char:%3u byte\n", sizeof(char));
printf("int:%3u byte\n", sizeof(int));
printf("float:%3u byte\n", sizeof(float));
return 0;
}

and check for int option return value if it is 4bytes than ur system is 32bit and if it is 8bytes than the system is 64bit.
Tip:: If u r using EM64T system, then there must be an option in BIOS to enable and disable extended 64 bits. Try to play with this option when running this progarm.