Question

用三种循环结构分别编写程序,计算л的近似值

Answer 1

int main()

{

double sum = 1.;

double t = 3.;

while( fabs(1 / t) >= 10E-9 )

{

t = -1 / t;

sum += t;

if(t < 0)

{

t = 1 / t - 2;

}

else

{

t = 1 / t + 2;

}

}

double PI = sum * 4;

return 0;}

int main()

{

double sum = 1.;

double t = 3.;

for(; fabs(1 / t) >= 10E-9; )

{

t = -1 / t;

sum += t;

if(t < 0)

{

t = 1 / t - 2;

}

else

{

t = 1 / t + 2;

}

}

double PI = sum * 4;

return 0;

}

int main()

{

double sum = 1.;

double t = 3.;

do{

t = -1 / t;

sum += t;

if(t < 0)

{

t = 1 / t - 2;

}

else

{

t = 1 / t + 2;

}

}while( fabs(1 / t) >= 10E-9 );

double PI = sum * 4;

return 0;

}