C: Type casts

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A type cast is an explicit conversion of a value of one type into a value of another type. Here is the C code.

#include <stdio.h>

int main() {
	double x1;
	int i1;
	x1 = 3.9;
	i1 = x1;
	printf("1. x1=%lf i1=[%d] (i1 is truncated)\n",x1,i1);
	x1 = 3 / 4;
	printf("2. x1=%lf\n",x1);
	x1 = 3.0 / 4;
	printf("3. x1=%lf\n",x1);
	x1 = 3 / 4.0;
	printf("4. x1=%lf\n",x1);
	x1 = 3.0 / 4.0;
	printf("5. x1=%lf\n",x1);
	x1 = (double) 3 / 4;
	printf("6. x1=%lf\n",x1);
	x1 = 3 / (double) 4;
	printf("7. x1=%lf\n",x1);
	x1 = (double) 3 / (double) 4;
	printf("8. x1=%lf\n",x1);
	return 0;
	}

Here is the output of the C code.

1. x1=3.900000 i1=[3] (i1 is truncated)
2. x1=0.000000
3. x1=0.750000
4. x1=0.750000
5. x1=0.750000
6. x1=0.750000
7. x1=0.750000
8. x1=0.750000

Note: Only when both operands are integer is the result of a division (always) an integer.