homework

1.cpp

@@ -0,0 +1,27 @@
+#include <stdio.h>
+int main(){
+	int a, n, m, p, sum1 = 0, sum2 = 0, sum3 = 0;
+	printf("please put into a number between 0 and 100:  ");
+	scanf("%d",&a);
+
+	for(n = 0; n <= a; n = n +1){
+		sum1 = sum1 + n;
+	}
+	printf("%d\n",sum1);                   //for
+
+	while(m <= a){
+	    sum2 = sum2 + m;
+		m++;	
+	}
+	printf("%d\n",sum2);                  //while
+
+	do{
+	    p++;
+		sum3 = sum3 + p;	
+	}while(p < a);
+	printf("%d\n",sum3);                  //do while
+
+
+	return 0;
+
+} 

10.15(2).cpp

@@ -0,0 +1,33 @@
+#include <stdio.h>
+int main(){
+/*first
+	int i = 1;
+	float m = 3.2;
+	printf("%f  %d",m,i);*/
+/*second
+    printf("item\tunit\tpurchase\n\tprice\tdate\n");
+	printf("\\");
+	printf("\"");*/
+
+/*third
+	int i = 40;
+	float x = 839.21f;
+	printf("|%d|%5d|%-5d|%5.3d|\n",i,i,i,i);
+	printf("|%10.3f|%10.3e|%-10g|\n",x,x,x,x);*/
+
+/*Adds two fractions*/
+    int num1, denom1, num2, denom2, result_num, result_denom;
+
+    printf("Enter first fraction:"); 
+	scanf("%d/%d",&num1, &denom1);
+
+	printf("Enter second fraction:"); 
+	scanf("%d/%d",&num2, &denom2);
+
+	result_num = num1 * denom2 + num2 * denom1;
+	result_denom = denom1 * denom2;
+	printf("The sum is %d/%d\n",result_num, result_denom);
+
+	return 0;
+
+} 

10.15.cpp

@@ -0,0 +1,12 @@
+#include<stdio.h>
+int main(){
+	int height ,length ,width,v,v1;
+	scanf("%d",&height);
+	scanf("%d",&length);
+	scanf("%d",&width);
+
+	v = height*length*width;
+	v1 = (v+165)/166;
+	printf("%d",v1);
+	return 0; 
+}

9.26bug作业.cpp

@@ -0,0 +1,45 @@
+//��һԪ���η��̵ĸ�
+// ���� ��y = x2 + 10x + 17
+// �� x = 2, �� y = 41
+// �� y = 2, �� x = ? 
+/*#include <stdio.h>
+#include <math.h>
+int main() {
+  float x1, x2;
+  float y, a, b, c;
+  printf("������ϵ����\n");
+  scanf("%f, %f, %f, %f", &y, &a, &b, &c);
+  c =  c - y;
+  a = 2 * a;
+  float temp = sqrt(b*b - 4* a*c);
+  x1 = (-b + temp)/(a);
+  x2 = (-b - temp)/(a);
+  printf("һԪ���η��̸���\n");
+  printf("%f\n", x1);  //������ʲô�� 
+  printf("%f\n", x2);
+  return 0;
+}*/ 
+//��13���н�a����Ϊ2������˵�14���е�4*a*c��Ϊ8*a*c����ʽ�������Գ�Ϊ��bug�� 
+
+
+ //��һԪ���η��̵ĸ�
+// ���� ��y = x2 + 10x + 17
+// �� x = 2, �� y = 41
+// �� y = 2, �� x = ? 
+#include <stdio.h>
+#include <math.h>
+int main() {
+  float x1, x2;
+  float y, a, b, c;
+  printf("������ϵ����\n");
+  scanf("%f, %f, %f, %f", &y, &a, &b, &c);
+  c =  c - y;
+  float temp = sqrt(b*b - 4* a*c);
+  a = 2 * a;
+  x1 = (-b + temp)/(a);
+  x2 = (-b - temp)/(a);
+  printf("һԪ���η��̸���\n");
+  printf("%f\n", x1);  //������ʲô�� 
+  printf("%f\n", x2);
+  return 0;
+} //��˳������󼴿� 

HelloWorld.c

@@ -1,6 +1,6 @@
 #include <stdio.h>
 int main() {
-  printf("Hello World!\n");
+  printf("Hello World!aaa\n");
 
 //try Jenkins again 
   return 0;

average.cpp

@@ -0,0 +1,14 @@
+//��������������ƽ��ֵ������0����������� 
+#include <stdio.h>
+int main(){
+	int number, sum = 0, count = 0;
+
+	scanf("%d",&number);
+	while(number != 0){
+		sum += number;
+		count ++;
+		scanf("%d",&number);
+	}
+	printf("%f\n",1.0*sum/count);
+	return 0;
+} 

function sqrt2.cpp

@@ -0,0 +1,26 @@
+#include <stdio.h>
+float squart(float value){
+	float left = 0.0f;
+	float right = value;
+	float mid = (left + right)/2;
+	while((mid*mid - 2) > 0.01 ||(2 - mid*mid)> 0.01){
+		if (mid*mid < value){ 
+			left = mid;
+		}
+		else{
+			right = mid;
+		}
+	   mid = (left + right)/2; 
+	}
+	return mid;
+}
+
+int main(){
+float target = 2.0f;
+printf("%f",squart(target)); 
+	///squart(2.0f);
+	///printf("%f",mid); �������ص���mid��������ֵ������mid��������� 
+	return 0;
+}
+
+///�����ж�������������������ʡ�ԣ� float squart(float x,float y,float z){}      float����ʡ�� 

homework.cpp

@@ -0,0 +1,18 @@
+#include<stdio.h>
+int main(){
+	int i,n,k;
+	printf("��������������\n"); 
+	scanf("%d",&n);//
+	int a[n];
+	printf("�������飺\n");
+	for(i=0;i<n;i++){
+		scanf("%d",&a[i]);
+	}
+	printf("���������еĴ�ɾ���\n"); 
+	scanf("%d",&k);
+	for(i=0;i<n;i++){
+		if(a[i]==k) continue;
+		else printf("%d ",a[i]);
+	}
+	return 0;
+} 

homework1.cpp

@@ -0,0 +1,75 @@
+//��������������������λ���ֵĺͣ���λ���ֵ�ƽ���ͣ�����������
+#include <stdio.h>
+int isPrime(int b){ 	
+	int n,cont=0;
+	if(b==2){
+		return 1;
+	}
+	for(n=2;n<b;n++){
+		if(b%n==0)cont++;
+	}
+	if(cont!=0){
+		return 0;
+	}else return 1;
+}
+
+int sPrime(int b){
+	if (b<1000 && b>=100){
+		    //���λ���ֺ� 
+		//printf("%d�İ�λ��Ϊ%d��ʮλ��Ϊ%d����λ��Ϊ%d����λ���ֵĺ�Ϊ%d\n",b,b/100,(b/10)%10,(b%100)%10,(b/100)+((b/10)%10)+((b%100)%10));
+		if(isPrime((b/100)+((b/10)%10)+((b%100)%10))==1){
+			return 1;
+		}else return 0;		
+	}
+	else if (b<10000 && b>=1000){
+		//printf("%d��ǧλ��Ϊ%d����λ��Ϊ%d��ʮλ��Ϊ%d����λ��Ϊ%d����λ���ֵĺ�Ϊ%d\n",b,b/1000,(b/100)%10,((b/10)%100)%10,((b%1000)%100)%10,(b/1000)+((b/100)%10)+(((b/10)%100)%10)+(((b%1000)%100)%10));
+		if(isPrime((b/1000)+((b/100)%10)+(((b/10)%100)%10)+(((b%1000)%100)%10))==1){
+			return 1;
+		} else return 0;
+	}
+}
+
+int ssPrime(int b){
+	if (b<1000 && b>=100){
+		 //987
+        //���λ����ƽ���� 
+		//printf("%d�İ�λ��Ϊ%d��ʮλ��Ϊ%d����λ��Ϊ%d����λ���ֵ�ƽ����Ϊ%d\n",b,b/100,(b/10)%10,(b%100)%10,(b/100)*(b/100)+((b/10)%10)*((b/10)%10)+((b%100)%10)*((b%100)%10));
+		if(isPrime((b/100)*(b/100)+((b/10)%10)*((b/10)%10)+((b%100)%10)*((b%100)%10))==1){
+			return 1;
+		}else return 0;
+
+	}
+	else if (b<10000 && b>=1000){
+		//1765
+		//printf("%d��ǧλ��Ϊ%d����λ��Ϊ%d��ʮλ��Ϊ%d����λ��Ϊ%d����λ���ֵ�ƽ����Ϊ%d\n",b,b/1000,(b/100)%10,((b/10)%100)%10,((b%1000)%100)%10,(b/1000)*(b/1000)+((b/100)%10)*((b/100)%10)+(((b/10)%100)%10)*(((b/10)%100)%10)+(((b%1000)%100)%10)*(((b%1000)%100)%10));
+		if(isPrime((b/1000)*(b/1000)+((b/100)%10)*((b/100)%10)+(((b/10)%100)%10)*(((b/10)%100)%10)+(((b%1000)%100)%10)*(((b%1000)%100)%10))==1){
+			return 1;
+		} else return 0;
+	}
+} 
+
+int superPrime(int b){
+	if(isPrime(b)==1){
+		if(sPrime(b)==1){
+			if(ssPrime(b)==1){
+				printf("%d ",b);
+				return 1;
+			}else return 0;
+		}
+	}	
+}
+
+int main(){ 
+    int b=100,sum=0,k=0;
+	for(b=100;b<10000;b++){
+		if(superPrime(b)==1){
+			sum+=b;
+			k++;
+		}
+	}
+	printf("\n%f",(float)sum/k);
+	return 0;
+}
+
+
+

homework3.cpp

@@ -0,0 +1,27 @@
+//f(n)�����Ķ���Ϊ0~n�а�����1�ĸ���
+//f(13)��0~13���1���� 1��10��11��12��13������f(13)=6
+//f(1) = 1��
+//����һ��f(n)=n��nֵ
+// 2021-11-04
+
+#include<stdio.h>
+int f(int n){
+	int i,sum=0,k;
+	for(i=1;i<=n;i++){//13
+		for(k=i;k>0;){
+			if(k%10==1){
+				sum++;
+			}
+			k=k/10;
+		}
+	}
+	return sum;
+}
+int main(){
+	for(int i=0;i<100;i++){
+		if(f(i)==i)
+			printf("f(%d)=%d ",i,i);
+	}	
+	return 0;
+}
+

homework4.cpp

@@ -0,0 +1,36 @@
+#include<stdio.h>
+int isPrime(int b){ 	
+	int n,cont=0;
+	if(b==2){
+		return 1;
+	}
+	if(b<=0)return 0;
+	for(n=2;n<b;n++){
+		if(b%n==0)cont++;
+	}
+	if(cont!=0) return 0;
+	else return 1;
+}
+int ab(int a,int b){
+	int ret1=1,ret2=1;
+	int i=0;
+	for(i=0;i<b;i++){
+		ret1*=a;
+	}
+	for(i=0;i<a;i++){
+		ret2*=b;
+	}
+	return ret1+ret2;
+}
+int main(){
+	int p,q;
+	for(p=0;p<10;p++){
+		for(q=0;q<10;q++){
+			if(isPrime(p)==1&&isPrime(q)==1&&isPrime(ab(p,q))){
+				printf("%d %d\n",p,q);
+			}	
+		}
+	}
+
+	return 0;
+}

homework5.cpp

@@ -0,0 +1,35 @@
+//����һ���ַ���������
+//3072x1728,2720x1536,2560x1600,2560x1440,2304x1728,2048x1536,1920x1200,1920x1080,1440x900,1280x800,1280x720,1024x768,1024x640,800x600,800x500,800x450,640x480,640x400,640x360,480x360,480x300,480x270,320x240,320x200,320x180,240x180,176x144,160x120,160x100,160x90
+//����һ����ʾ��֧�ֵķֱ����嵥���м䶺�ŷָ���
+//�������뻭��Ŀ��͸ߣ�Ȼ���������嵥����ѡһ����ӽ��ķֱ������
+//��������2000��1000������ķֱ���Ӧ����1920x1080����Ϊ�����ֱ��ʵ�������
+//������³���
+// 2021-11-14
+#include <stdio.h>
+int main(){
+    int x,y,i,j,mid,b[30];
+    scanf("%d %d", &x, &y);
+	int a[30][2]={{3072,1728},{2720,1536},{2560,1600},{2560,1440},{2304,1728},{2048,1536},{1920,1200},{1920,1080},{1440,900},{1280,800},{1280,720},{1024,768},{1024,640},{800,600},{800,500},{800,450},{640,480},{640,400},{640,360},{480,360},{480,300},{480,270},{320,240},{320,200},{320,180},{240,180},{176,144},{160,120},{160,100},{160,90}};
+	for(i=0;i<30;i++){
+		if(x*y-a[i][0]*a[i][1]<0){
+			b[i]=a[i][0]*a[i][1]-x*y;
+		}else b[i]=x*y-a[i][0]*a[i][1];
+	}
+    for(i=0;i<30;i++){
+    	for(j=0;j<29-i;j++){
+    		if(b[j]>b[j+1]){
+    			mid=b[j+1];
+    			b[j+1]=b[j];
+    			b[j]=mid;
+			}
+		}
+	}
+    for(i=0;i<30;i++){
+    	if(b[0]==a[i][0]*a[i][1]-x*y||b[0]==x*y-a[i][0]*a[i][1]){
+    		printf("ѡ�еķֱ�����%d��%d",a[i][0],a[i][1]);
+		}
+	}
+
+    return 0;
+}
+