目录
1.简单计算器
#include<stdio.h> int main() { double n1 = 0.0; double n2 = 0.0; char ch = ' '; while (scanf("%lf%c%lf", &n1, &ch, &n2) != EOF) { switch (ch) { case '*': printf("%.4lf%c%.4lf=%.4lf\n", n1, ch, n2, n1 * n2); break; case '+': printf("%.4lf%c%.4lf=%.4lf\n", n1, ch, n2, n1 + n2); break; case '/': if (n2 == 0) { printf("Wrong!Division by zero!\n"); break; } else printf("%.4lf%c%.4lf=%.4lf\n", n1, ch, n2, n1 / n2); break; case '-': printf("%.4lf%c%.4lf=%.4lf\n", n1, ch, n2, n1 - n2); break; default: printf("Invalid operation!\n"); } } return 0; }
2.带空格直角三角形图案
方法1:
先打印空格,再打印*。
#include<stdio.h> int main() { int n = 0; while(scanf(" %d",&n)!=EOF) { int i = 0; for(i = 0;i<n;i++) { int j = 0; for(j = 0;j<n-i-1;j++) { printf(" "); } for(j = 0;j<=i;j++) { printf("* "); } printf("\n"); } } return 0; }
方法2:
(找规律)
#include<stdio.h> int main() { int n = 0; while (scanf("%d", &n) != EOF) { int i = 0; for ( i = 0; i < n; i++) { int j = 0; for (j = 0; j < n; j++) { if (i + j < n-1) { printf(" "); } else { printf("* "); } } printf("\n"); } } return 0; }
3. 有序序列插入一个数
#include<stdio.h> #include<malloc.h> int main() { int N = 0; int X = 0; scanf("%d",&N); int *arr = (int*)malloc(sizeof(int)*(N+1)); arr[N] = 0; for(int i = 0;i<N;i++) { scanf("%d",&arr[i]); } scanf("%d",&X); int i =0; for(i = N-1;i>=0;i--) { if(arr[i]>X) { arr[i+1] = arr[i]; } else { arr[i+1] = X; break; } } if(i<0) { arr[0] = X; } for(int i = 0;i<N+1;i++) { printf("%d ",arr[i]); } return 0; }