实验1 C语言开发环境使用和数据类型、运算符、表达式
#include<stdio.h> int main(){ printf(" 0\n "); printf("<H>\n"); printf("I I \n\n"); printf(" 0 \n"); printf("<H>\n"); printf("I I \n"); return 0; }
#include<stdio.h>
int main(){
printf(" 0 0\n");
printf("<H> <H>\n");
printf("I I I I\n");
return 0;
}
#include <stdio.h> int main(){ int n, r1, r2, r3, r4; n= 101; r1 = n*(n+1)/2; r2 = (n+1)*n/2; r3 = n/2*(n+1); r4 = (n+1)/2*n; printf("n = %d\n",n); printf("r1 = %d\n",r1); printf("r2 = %d\n",r2); printf("r3 = %d\n",r3); printf("r4 = %d\n",r4); return 0; }
#include <stdio.h> int main(){ int n, r1, r2, r3, r4; n= 100; r1 = n*(n+1)/2; r2 = (n+1)*n/2; r3 = n/2*(n+1); r4 = (n+1)/2*n; printf("n = %d\n",n); printf("r1 = %d\n",r1); printf("r2 = %d\n",r2); printf("r3 = %d\n",r3); printf("r4 = %d\n",r4); return 0; }
#include<stdio.h> int main(){ int x, y; int r1, r2, r3, r4; x = 1; y = 2; r1 = x + y; r2 = x - y; r3 = x * y; r4 = x / y; printf("r1 = %d\n", r1); printf("r2 = %d\n", r2); printf("r3 = %d\n", r3); printf("r4 = %d\n", r4); return 0; }
#include<stdio.h> int main(){ float x, y; float r1, r2, r3, r4; x = 1; y = 2; r1 = x + y; r2 = x - y; r3 = x * y; r4 = x / y; printf("r1 = %f\n", r1); printf("r2 = %f\n", r2); printf("r3 = %f\n", r3); printf("r4 = %f\n", r4); return 0; }
// 测试你是哪一类学习者 #include <stdio.h> int main() { int answer; char words[5000]; printf("网课学习让一些人欢喜一些人忧.\n"); printf("1. 作为一个宅,社恐,觉得这样很好,有网络, 自主学习,很ok.\n"); printf("2. 不喜,不喜,很不喜,眼睛快瞎了,脑壳有点卡...\n") ; printf("3. 中间派,不知道,说不清.\n"); printf("4. 其它...\n "); printf("你的选择;"); scanf("%d", &answer); if(answer== 4){ printf("请补充说明你的想法;\n"); getchar(); gets(words); } printf("\n"); printf("当遇到问题时,你会选择:\n"); printf("1. 遇到问题,就解决问题。不懂得,搜索式学习,逐个攻破.\n"); printf("2. 遇到问题,不高兴。然后,...,没有了.\n"); printf("3. 其它...\n"); printf("你的选择; "); scanf("%d", &answer); if(answer == 1) printf(":)\n"); else if(answer == 2) printf("这样不能解决问题啊...我们选择1好不好:)\n"); else if(answer == 3){ printf("请补充说明你的想法;\n"); getchar(); gets(words); } return 0; }
实验2两次运行r4不同是因为一次r4要求为整型,一次要求为浮点型。
实验3中第7行表示n*(n+1)的值,再除以2;第8行表示(n+1)*n的值,再除以2
第9行表示求出n除以2的商,再乘以(n+1);第十行表示求出(n+1)除以2的商,再乘以n
当n为奇数时,n/2的整型等于(n-1)/2;当n为偶数时,(n+1)/2的整型等于n/2
五、实验总结
要注意区分整型int和浮点型float;%d表示占位字符;当int替换成float时,要将%d换为%f;要注意“;”的使用。