实验四

#include<stdio.h>
#include<math.h>
void solve(double a,double b,double c);
int main(){
double a,b,c;
printf("Enter a,b,c");
while(scanf("%lf%lf%lf",&a,&b,&c)!=EOF){
solve(a,b,c);
printf("Enter a,b,c:");

}
return 0;
}
void solve(double a,double b,double c){
double x1,x2,delta,real,imag;
delta=b*b-4*a*c;
if(a==0)
printf("不是一元二次方程组\n");
else{
if(delta>=0){
x1=-b+sqrt(delta)/(2*a);
x2=-b-sqrt(delta)/(2*a);
printf("x1=%f\nx2=%f\n",x1,x2);
}
if(delta<0){
real=-b/(2*a);
imag=sqrt(-delta)/(2*a);
printf("x1=%f+%fi\nx2=%f-%fi\n",real,imag,real,imag);

}


}
}

#include<stdio.h>
long long fac(int n);
int main(){
int i,n;
printf("Enter n:");
scanf("%d",&n);
for(i=1;i<=n;i++){
printf("%d!=%lld\n",i,fac (i));
}
return 0;
}
long long fac(int n){
static long long p=1;
printf("p=%lld\n",p);
p=p*n;
return p;
}

#include<stdio.h>
int func(int,int);
int main(){
int k=4,m=1,p1,p2;
p1=func(k,m);
p2=func(k,m);
printf("%d,%d",p1,p2);
return 0;
}
int func(int a,int b){
static int m=0,i=2;
i=i+m+1;
m=i+a+b;
return m;

}

#include<stdio.h>
#define N 1000
int fun(int n,int m,int bb[N]);
int main(){
int n,m,i,k,bb[N];
scanf("%d",&n);
scanf("%d",&m);
for(i=0;i<m-n;i++){
bb[i]=0;
}
k=fun(n,m,bb);
for(i=0;i<k;i++){
printf("%4d",bb[i]);
}
return 0;

}
int fun(int n,int m,int bb[N]){
int j,k=0,flag;
for(j=n;j<m;j++){
flag=1;
for(int i=2;i<j;i++){
if(j%i==0){
flag=0;
break;
}

}
if(flag)
bb[k++]=j;
}
return k;
}