/* 定义和调用求阶乘函数生成阶乘表 */ #include<stdio.h> double fact(int n); int main(void) { int i,n; double result; printf("Enter n:"); scanf_s("%d",&n); for(i=0;i<=n;i++){ result=fact(i); printf("%d!=%.0f ",i,result); } return 0; } double fact(int n) { int i; double product; product=1; for(i=1;i<=n,i++;){ product=product*i; } return product; }
/* 调用幂函数pow()生成乘方表 */ #include<stdio.h> #include<math.h> int main(void) { int i,n; double power; printf("Enter n:"); scanf_s("%d",&n); for(i=0;i<=n;i++){ power=pow((double)2,i); printf("pow(2,%d)=%.0f ",i,power); } return 0; }
/* 输入一个正整数n, 求n! */ #include<stdio.h> int main(void) { int i,n; double product; printf("Enter n:"); scanf_s("%d",&n); product=1; for(i=1;i<=n;i++){ product=product*i; } printf("product=%.0f ",product); return 0; }
/* 计算1-1/3+1/5-1/7+… 共n项之和 */ #include<stdio.h> int main(void) { int denominator,flag,i,n; double item,sum; printf("Enter n:"); scanf_s("%d",&n); flag=1; denominator=1; sum=0; for(i=1;i<=n;i++){ item=flag*1.0/denominator; sum=sum+item; flag=-flag; denominator=denominator+2; } printf("sum=%f ",sum); return 0; }
/* 计算 1+2+3+…+n */ #include<stdio.h> int main(void) { int i,n,sum; printf("Enter n:"); scanf_s("%d",&n); sum=0; for(i=1;i<=n;i++){ sum=sum+i; } printf("Sum of numbers from 1 to %d is %d is %d ",n,sum); return 0; }