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how to use 'long long int' or 'unsigned long int' in C prog

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rizalafande

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long int in c

hi,
i got the problems to use the 'long long int' and 'unsigned long int' data types in C programming (becasue i would like to use 64bit and unsigned 32bit data in my design). when i run the simulation using Linux compiler (gcc), it is always give me an error "warning: this decimal constant is unsigned only in ISO C90". example of my codes are written below.
===================
long long int newValue (long long int a)
{
unsigned long int res;

a = 2147483700;
res = a*1;

}
====================
can anyone helps me out. thanks.
 

long long int in c

First, you have a return of long long int, buy there is no return of anything in the fucntion. Second whis is res an unsigned long int and a is a long long int? The compiler is warning you that this is valid only in the iso c90 standard. I assume other standards will treat one as signed and the other as unsigned.

And it appears that unsigned long int is a 32 bit value (check this) and long long int is definitely a 64 bit integer. Just change res to long long int.
 

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