c語言求pi的近似值

① c語言編程，求π的近似值

#include <stdio.h>

#include <math.h>

int main()

{

int x,z;

float y;

y=0;

z=0;

for(x=1;fabs(1.0/x)>1e-6;x+=2)

{

z=z+1;

if(z%2!=0)

{

y=y+1.0/x;

}

else

{

y=y-1.0/x;

}

}

y=y*4;

printf("π=%10.6f ",y);

return 0;

}