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// 一元二次方程求解 // 重复执行, 直到按Ctrl+D或Ctrl+E结束 // #include <math.h> #include <stdio.h> #include <stdlib.h> int main() { float a, b, c, x1, x2; float delta, real, imag; printf("Enter a, b, c: "); while(scanf("%f%f%f", &a, &b, &c)) { if(a == 0) printf("not quadratic equation.\n"); else { delta = b*b - 4*a*c; if(delta >= 0) { x1 = (-b + sqrt(delta)) / (2*a); x2 = (-b - sqrt(delta)) / (2*a); printf("x1 = %f, x2 = %f\n", x1, x2); } else { real = -b/(2*a); imag = sqrt(-delta) / (2*a); printf("x1 = %f + %fi, x2 = %f - %fi\n", real, imag, real, imag); } } printf("Enter a, b, c:\n"); } system("pause"); return 0; }
#include <stdio.h> #include <stdlib.h> #include <time.h> int main() { int guessNumber; // 存放程序运行时生成的1~100之间的随机整数 int ans; // 存放用户猜的数字 srand((time(0))); // 以时间函数作为随机种子 guessNumber = 1 + rand()%100; // 生成1~100之间的随机数 do { printf("your guess number is(1~100): "); scanf("%d", &ans); if(ans < guessNumber) printf("%d is lower than the number.\n", ans); else if(ans > guessNumber) printf("%d higher then the number.\n", ans); }while(ans != guessNumber); printf("Congratulations. you hit it~\n"); system("pause"); // 在devc中运行时,这一行可以去掉 return 0; }
#include <stdio.h> #include <stdlib.h> int main() { int number, max, min, n; n=1; printf("输入第%d个数: ", n); scanf("%d", &number); max = number; min = number; while(n < 5) { n++; printf("输入第%d个数: ", n); scanf("%d", &number); if(max < number) max = number; else if(min > number) min = number; } printf("最大数为: %d\n", max); printf("最小数为: %d\n", min); system("pause"); return 0; }
#include<stdio.h> #include<math.h> int isprime(int n); int main() { int i; int m; m=0; for(i=101;i<=200;i++) { if(isprime(i)) { printf("%4d",i); m++ ; if(m%5==0) printf("\n"); } } printf("\n"); printf("101~200之间共有%d个素数",m); return 0; } int isprime(int n) { int k; for(k=2;k<=sqrt(n);k++) if(n%k==0) return 0; return 1; }
#include<stdio.h> #include <stdlib.h> int main() { long s; printf("Enter a number:"); int a,b=0,c=1; scanf("%ld",&s); while(s>0){ a=s%10; s=s/10; if(a%2!=0){ b=b+a*c; c=c*10; } else b=b+0; } printf("new number is :%d",b); return 0; }
原文:https://www.cnblogs.com/zhang654321/p/11894674.html