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[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
我在程序的素數部分遇到了麻煩。 當我編譯並運行程序時,素數對第一個數字的輸出很好,但是在提示您輸入另一個數時卻很好。 它通常不打印任何數字,或者從某個點向下切掉質數。 我是本次論壇的編碼新手,對於帖子中的任何格式問題,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);
}
您永遠不會重置變量q,它是質數循環的控制變量。 最佳做法是創建所有需要在循環內重置的變量。 在循環的開始/結束處重置q,或在外部循環的開始處創建q並將其設置為2。
像這樣:
while(number != 1000) {
int q = 2;
//other assignments below which need to be reset
...
//all other code below
...
}
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