我正在try 制作一个程序,它接受两个用户输入(x和y),判断区间内的所有数字是否都是素数,然后只打印三个最大的素数(如果可用).到目前为止,我的代码以从最大到最小的间隔判断所有素数.
我的代码:
#include <stdio.h>
#include <stdlib.h>
void inputXY(int *x, int *y) {
printf("Enter value of x: ");
scanf("%d", x);
printf("Enter value of y: ");
scanf("%d", y);
}
void swap(int*x, int*y){
int temp;
temp = *x;
*x=*y;
*y=temp;
}
int primechecker(int divisor,int dividend){
if(dividend==divisor) return 1;
else if(dividend%divisor==0) return 0;
else primeChecker(divisor+1,dividend);
}
void largestonly(int*counter, int*largest1, int*largest2, int*largest3){
int temp;
temp=*counter;
if (temp>*largest1&&*largest2) ///incomplete attempt
}
void printlargest(int *x, int *y, int*largest1, int*largest2, int*largest3){ ///I do not know if this would work, since I have not equated largest1, largest2, and largest3 to zeroes. My idea here is that, if any specific variables are empty, different specific lines should be printed.
if (*largest1==0&&(*largest2&&*largest3!=0)) {
printf("There are two prime numbers: ");
printf("%d, %d", *largest2, *largest3);
}
else if (*largest1&&*largest2==0&&*largest3!=0){
printf("There is only one prime number: ");
printf("%d", *largest3);
}
else if (*largest1&&*largest2&&largest3!=0){
printf("The three largest prime numbers between %d and %d are: ", *x, *y);
printf("%d, %d, %d", *largest1, *largest2, *largest3);
}
else if (*largest1&&*largest2&&largest3==0){
printf("No prime numbers found!");
}
}
int main(){
int x,y,largest1, largest2, largest3, counter, divisor, dividend, i;
divisor=2;
dividend=counter;
inputXY(&x, &y);
if ((x&&y==0),(x&&y==1)) printf("Invalid range!\n");
if (x>y) swap(&x, &y);
for (i=0; i<=3; i++){
for(counter=y;counter>=x;counter--) {
if (primechecker(divisor,counter)==1) largestonly(&counter, &largest1, &largest2, &largest3);
}
}
printlargest(&x, &y, &largest1, &largest2, &largest3);
return 0;
}
一个排序函数可以成功地写出main()
个整数.如上图所示,这是largestonly()
函数.与此相关,我的printlargest()
函数无疑不起作用.我在这里的 idea 是,如果largest1
不包含任何值(或等于0
或其他我想不出的更合适的值),函数将只打印找到的两个最大素数.相对而言,如果largest1
和largest2
都为空,则只打印最大的素数.如果所有变量都为空,则应打印"No prime numbers found!"
.目前我对如何处理我的代码感到非常困惑,因此任何类型的帮助都将不胜感激.非常感谢.