C语言求素数问题 求大神!

--------------------Configuration: C16 - Win32 Debug--------------------
Compiling...
C16.CPP
E:\learning\C语言\C16.CPP(12) : error C2440: '=' : cannot convert from 'void' to 'int'
Expressions of type void cannot be converted to other types
E:\learning\C语言\C16.CPP(19) : error C2065: 'rewrite' : undeclared identifier
E:\learning\C语言\C16.CPP(31) : error C2065: 'o' : undeclared identifier
E:\learning\C语言\C16.CPP(32) : error C2562: 'sushu' : 'void' function returning a value
E:\learning\C语言\C16.CPP(2) : see declaration of 'sushu'
Error executing cl.exe.

C16.OBJ - 4 error(s), 0 warning(s)

错哪了....

#include <stdio.h>
void sushu(int a);

void main ()
{
int a,w;
printf("please input a number\n");
scanf("%d",&a);
if (a>2)
sushu(a);

w=sushu(a);
if (w==0)

printf("you printf is sushu\n");
if (a=2)
printf ("you printf is sushu\n");
else
rewrite();
printf("hahaha\n");

}
void sushu(int a)
{
int n,m;
//while (n>(a-1))
for (n=1;n>(a-1);n++)
{
m=a%n;
if (m=o)
return (1);
}
//if(m=0)
// printf("")
}

#include <stdio.h>
int sushu(int a);
int main ()
{
int a,w;
printf("please input a number\n");
scanf("%d",&a);
if (a>2)
sushu(a);
w=sushu(a);
if (w==0)
printf("you printf is sushu\n");
if (a=2)
printf ("you printf is sushu\n");
else
printf("hahaha\n");
return 0;
}
int sushu(int a) //你有返回类型 不应该用void 应该用int类型
{
int n,m; //while (n>(a-1))
for (n=1;n>(a-1);n++)
{
m=a%n;
if (m==0) //m的赋值错了
return (1);
} //if(m=0) // printf("")
}
还有就是rewrite();这个函数你根本就没写 怎么调用 提示你这个rewrite();没有定义

我真是看到个奇了个葩.你sushu是无返回值你还在前面加个w=? 你数字零能打成字母欧?你英语和数学一个老师教的吧? 你rewrite 函数定义了吗?没定义你咋用? 就算你把这些错给改了,你这程序照样是错的.

#include #include void main() { int m,n,x,i,j=0,temp; int a,b; printf("input two nums:\n"); scanf("%d,%d",&m,&n); a=(m>n)?n:m; b=m>n?m:n;窢担促杆讵访存诗担涧47;/调整mn的大小顺序 for(x=a;x<=b;x++) { temp=(int)sqrt(x); for(i=2;i<=temp;i++) if(!(x%i)) break;//有合数跳出本次循环 if (i>temp) { printf("%d ",x); j++; if(!(j%5)) printf("\n"); //格式，每找到5个换行 } } getch(); }