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#include <stdio.h>
//#define tinyvar(var) (var&=0xF)

int suntypes (char tamanho,char flag) {
    int n;
    if (!flag) n = (tamanho <= 2 ? (tamanho*8)-tamanho : (tamanho*8)-tamanho+1);
    else n = tamanho*8-(tamanho>>1);
    return (tamanho<<n)-1;

int main() {
    int i = sizeof(int);
    printf("Valor maximo signed: %d, unsigned: %u\n",suntypes(i,0),suntypes(i,1));
    return 0;

Como podem ver, essa função retorna o máximo que um tipo de variável suporta, exceto double e float.

Edited by fetish
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