以下能够实现计算 5！的程序段是 A)int fac=1,k=0; do{ k++; fac*=k;} while(k<5); B)int fac=0,k=1; do{ fac*=k; k++;} while(k<5); C)int fac=1,k=1; do{ k++; fac*=k;} while(k<=5); D)int fac=1,k=0; do{ fac*=k; k++;} while(k<5);
缩小规模，细心计算
答案：A
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