# include & ltmath.h & gt

Invalid? Master ()

{

Double? s=0，pi，t，d，c；

Double? I，n，j = 1； ? //It's all changed to double here.

for(i=2，n = 1； fabs( 1/n)>pow( 10，-6)； i++，n++ = 2)

s=s+pow(- 1，I)* j/n； ? //Otherwise, this is the division of shaping, and the result will be rounded.

printf("%lf\n "，s)； ? //Since s is a double, %lf should be used.

printf("pi=%lf\n "，pi = s * 4)；

}