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2024年3月14日发(作者：北大青鸟前端开发)
S2_1
#include
using namespace std;
void main()
{
float a,b,c;
cout<<"input a b cn";
cin>>a>>b>>c;
if((a+b cout<<"Not Trianglen"; else cout<<"Trianglen"; } S2_2 #include using namespace std; void main() { int year; cout<<"Input year: "; cin>>year; if((year%4==0&&year%100!=0)||(year% 400==0)) cout< else cout< } S2_3 #include using namespace std; void main() { float a1, a2; char oper; float result; int flag=0; cout<<"请输入简单的运算式:n"; cin>>a1>>oper>>a2; switch(oper) { case'+': result=a1+a2; break; case'-': result=a1-a2; break; case'*': result=a1*a2; break; default: cout<<"输入错误的运算符!n"; flag=1; } if(flag==0) cout< } S2_4 #include #include using namespace std; void main() { float a,b,c,x1,x2; cout<<"请输入方程的3个系数a b c n"; cin>>a>>b>>c; x1=(-b+sqrt(b*b-4*a*c))/2*a; x2=(-b-sqrt(b*b-4*a*c))/2*a; if(b*b-4*a*c<0) cout<<"无实根!n"; else cout<<"x1="< cout<<"x2="< } S3_1 #include using namespace std; void main() { int x,y; for(x=1;x<=30;x++) for(y=1;y<=30;y++) if(x+y==30&&2*x+4*y==90) cout<<"鸡有 1 "< } S3_2 #include void main() { int a0,a1,a2; int b; for(a2=1;a2<=9;a2++) for(a1=1;a1<=9;a1++) for(a0=1;a0<=9;a0++) { b=100*a2+10*a1+a0; if(b==a2*a2*a2+a1*a1*a1+a0*a0*a0) cout< } } S3_3 #include void main() { int a0,a1,a2; int b; for(b=100;b<=999;b++) { a2=b/100; a1=(b/10)%10; a0=b%10; if(b==a0*a0*a0+a1*a1*a1+a2*a2*a2) cout< } } S3_4 #include void main() { int a,b,c; for(a=1;a<=36;a++) for(b=1;b<=36;b++) for(c=1;c<=36;c++) if(a+b+c==36&&a*4+b*2+c/2==36&&c %2==0) cout<<"男人"< } S3_5_1 #include void main() { int a; for(a=1;a<=599;a++) { if((a%10==5||(a/10)%10==5||(a/10/10)% 10==5)&&(a%3==0)) cout< } } S3_5_2 #include void main() { int a,b,c=0; cout<<"请输入整数:"; cin>>a; while(a) { b=a%10; c=c+b; a=a/10;} cout< } S4_1 #include void main() { int a,b; int x,t; cout<<"请输入两个正整数:"; cin>>a>>b; x=a*b; if(a { t=a;a=b;b=t;} while(t=a%b) { a=b; b=t; } cout<<"最大公约数:"< cout<<"最小公倍数:"< } S4_2 #include void main() { int a, b,c; cout<<"Input three number:"; cin>>a>>b>>c; for(int i=a;;i--) if(a%i==0&&b%i==0&&c%i==0) break; cout< } S4_3 #include #include void main() { int a; cout<<"请输入一个整数:"; cin>>a; for(int i=2;i if(a%i==0) break; if(a%i!=0) cout< else cout< } S4_4 #include void main() { int a,b,c,x; cout<<"Input three number:"; cin>>a>>b>>c; for(x=a;;x++) if(x%a==0&&x%b==0&&x%c==0) break; cout< } S4_5 #include void main() { int a; for(a=100;a<=200;a++) { for(int b=2;b if(a%b==0) break; if(a==b) cout< } } S4_6 # include using namespace std; int main () { int n,i,sum; for(n=2;n<1000;n++) { //p=n/2; sum=0; for (i=1;i { if (n%i==0) sum =sum+i; } if (sum ==n) cout < } return 0; } S5_1 #include void main() { int a=2,b=1 ,c=0; for(;b<=7;b++) { c+=a; a=a*10+2; } cout< } S5_2 #include void main() { int a=2,b=1 ,c=0; for(;b<=7;b++) { c+=a; a=a*10+2; } cout< } S5_3 #include #include double x; int main() { cout<<"Input x :"; cin>>x; double y1,y2=x; do{ y1=y2; y2=2.0/3.0*y1+x/(3.0*y1*y1); }while(fabs(y1-y2)>=1e-5); cout <<"y="< return 0; } S5_4 #include void main() { float x; cout<<"Input x :"; cin>>x; int n=1; float g=0; float t=x; do{ g+=t; n++; t=-t*x*x/(2*n-1)/(2*n-2); }while(n<=10); cout< } S6_1 include double abc(double x) { double y; y=2*x*x+3*x+5; return y;} void main() { double a,b; a=abc(1); b=abc(1.2); cout<<"a="< cout<<"b="< } S6_2 #include #include float f(float x) {float y; y=x*x+3*x-4; return y;} float df( float x) {float y; y=2*x+3; return y; } void main() { float x0,x1; x1=0; do{ x0=x1; x1=x0-f(x0)/df(x0);} while(fabs(f(x0))>=1e-5); cout<<"x="< } S6_3 #include #include float f(float x) {return x*x+3*x-4;} void main() { float x1,x2,x0; do{ cout<<"请输入初值x1和x2: "; cin>>x1>>x2;}while(f(x1)*f(x2)>0); do{ x0=(x1+x2)/2; if(f(x0)*f(x1)>0) x1=x0; else x2=x0;} while(fabs(f(x0))>=1e-5);