1例四:求1-1+ 十一十...十 2345 Oo 100 S1: sign=1 S2: sum=1 s3: deno=2 S4: sign =(-1)x sign S5: term=sign x(1/deno) S6:sum=sum+term S7: deno=deno+1 s8:若deno≤100返回S4;否则结束◼例四：求 S1: sign=1 S2: sum=1 S3: deno=2 S4: sign=(-1) x sign S5: term=sign x(1/deno) S6: sum=sum+term S7: deno=deno+1 S8: 若deno≤100返回S4；否则结束 100 1 99 1 .... 5 1 4 1 3 1 2 1 1− + − + + + −