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float.c
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float.c
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//float
//Lozov Petr
//11.10.12
#include <stdio.h>
union float_int
{
float f;
int i;
};
void print_float(int);
int mantis(int);
void space(int);
int mant[22];
int main()
{
union float_int fi;
system("cls");
scanf("%f", &fi.f);
system("cls");
print_float(fi.i);
return 0;
}
void print_float(int n)
{
int znak, exp, mant_length, i;
znak =(n & (1 << 31));
exp = ((n & (~(1 << 31))) >> 23) - 127;
mant_length = mantis(n);
if (exp == 128)
{
if (mant_length != 0) printf("NaN");
else
{
if (znak == 0) printf("Infinity");
else printf("-Infinity");
}
}
else
{
if ((exp == -127) && (mant_length == 0))
{
if (znak == 0) printf("0");
else printf("-0");
}
else
{
if (znak == 0) printf(" %d\n1 * 2", exp);
else printf(" %d\n(-1) * 2", exp);
space(exp);
if (mant_length == 0) printf("1");
else
{
if (exp != -127) printf("1.%d", mant[0]);
else
{
if (mant_length == 1) printf("1");
else printf("%d.", mant[0]);
}
for (i = 1; i < mant_length; i++) printf ("%d", mant[i]);
}
}
}
}
int mantis(int n)
{
int i, lenght = 0;
for (i = 0; i <= 22; i++)
{
if ((n & (1 << i)) != 0)
{
if (lenght == 0) lenght = 23 - i;
mant[22 - i] = 1;
}
else mant[22 - i] = 0;
}
return lenght;
}
void space(int exp)
{
if (exp < 0) printf(" ");
exp = abs(exp);
if (exp <= 9) printf(" * ");
if ((exp >= 10) && (exp <= 99)) printf(" * ");
if (exp >= 100) printf(" * ");
}