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Número real mostrando parte inteira e fraccionária.

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Um Utilizador Introduz um numero real e o programa deve ser capaz de mostrar a parte inteira e a parte decimal.

#include <stdio.h>

float num;
printf("Introduza um numero com parte decimal");
   	scanf("%f", &num);
   	printf("Parte Inteira : %d",(int) num);
   	printf("Parte Decimal : %f", num - ((int)num));

acontece que quando executo a parte decimal vai me dar por exemplo se num = 12,85 a parte decimal dá 0.850000 querendo eu apenas que mostre 0,85 retirando os 0.

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