[英]I need to do a program for school “given a number establish the sum of its prime divisors” but I don't understand why my program doesn't work
[英]Can't seem to find why my Prime Number Program doesn't work properly after reprompt for number
我在程序的素数部分遇到了麻烦。 当我编译并运行程序时,素数对第一个数字的输出很好,但是在提示您输入另一个数时却很好。 它通常不打印任何数字,或者从某个点向下切掉质数。 我是本次论坛的编码新手,对于帖子中的任何格式问题,我深表歉意。
#include <stdio.h>
#include <math.h>
int main(void)
{
int number, n=1;
long factorial=1;
int a=1, b=0,c;
int q=2, r=2, w=0;
int prime, count;
printf("Enter a Number:\n");
scanf("\n%d", &number);
while(number!=1000)
{
if(number<1||number>1000)
printf("Input is Invalid\n");
else
{
if(number==1000)
printf("Goodbye\n");
if(number<15)
{
factorial=number;
n=number-1;
while(n>=1)
{
factorial=factorial*n;
n--;
}
printf("The Factorial of %d is: %ld\n", number, factorial);
}
c=a+b;
printf("Fibonacci Sequence up to %d\n ", number);
while(c<number&&a+b<number)
{
c=a+b;
a=b;
b=c;
n++;
printf("%d\t", c);
count=n;
if(count%10==0)
printf("\n");
}
printf("\nTotal:%d\n", n);
printf("\nPrime numbers up to %d:\n", number);
while(q<=number)
{
prime=0;
for(r=2;r<q;++r)
{
if(q%r==0)
{
prime=1;
}
}
if(prime==0)
{
printf("%d\t", r);
w++;
}
q++;
}
count=r;
if(count%10==0)
printf("\n");
printf("\nTotal:%d\n", w);
}
printf("\nEnter a Number:\n");
scanf("\n%d", &number);
a=1;
b=0;
}
return(0);
}
您永远不会重置变量q,它是质数循环的控制变量。 最佳做法是创建所有需要在循环内重置的变量。 在循环的开始/结束处重置q,或在外部循环的开始处创建q并将其设置为2。
像这样:
while(number != 1000) {
int q = 2;
//other assignments below which need to be reset
...
//all other code below
...
}
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