实验四

任务一 不可以因为返回值只能返回一个 而根有两个。

//ex2_1
#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\n",p1,p2) ;
    
    return 0;    
}

int func(int a,int b) {   
    static int m=0,i=2;
    
    i += m+1;
    m = i+a+b;  
    
    return (m);
}

//ex2_2

#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\n",p1,p2) ;
    
    return 0;    
}

int func(int a,int b) {   
    static int m=0,i=2;
    
    i += m+1;
    m = i+a+b;  
    
    return (m);
}
//报告！一致！8 17！qwq


//ex3
#include <stdio.h>

#define N 1000
int fun(int n,int m,int bb[N]) {
    int i,j,k=0,flag;
    
    for(j=n;j<=m;j++) {
        flag=1;   
        for(i=2;i<j;i++)
            if(j%i==0) {  
               flag=0;
               break;
        }
        if(flag) 
           bb[k++]=j;
    }
    return k;
}

int main(){
    int n=0,m=0,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;
}

//Ex4
#include <stdio.h>
long long fun(int n);    

int main() {
    int n;
    long long f;
    
    while(scanf("%d", &n) != EOF) {
        f = fun(n);  
        printf("n = %d, f = %lld\n", n, f);
    }
    
    return 0;
}


long long fun(int n){
    int p,m=1;
    for(int i=1;i<=n;i++){
        m*=2;
        
    }
    p=m-1;
    return p;
}

//ex5
#include <stdio.h>

void draw(int n, char symbol);  // 函数声明 

#include <stdio.h> 
int main() {
    int n, symbol;
    
    while(scanf("%d %c", &n, &symbol) != EOF) {
        draw(n, symbol);  // 函数调用 
        
        printf("\n");
    }
    
    return 0;
} 


void draw(int n,char symbol){
    int line=n-1;
    int num=1;

    for(int i=0;i<n;i++){
        for(int j=0;j<line;j++){
            printf(" ");
        }
        
        for(int k=0;k<2*num-1;k++){
            printf("%c",symbol);
        }
        printf("\n");
        line--;
        num++;
    }
    
}