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C语言第四天
大小写转换代码<wiz_tmp_tag id="wiz-table-range-border" contenteditable="false" style="display: none;">
# include <stdio.h>int main(int argc,constchar*argv[]){#if 0int a =10;if(a>0) printf("a>0");elseif(a==0) printf("a=0");else printf("a<0"); putchar(10);return0;#endifputs("please input word");int a =0; a= getchar();if(‘A‘<=a&&a<=‘Z‘){ putchar(a+32);}elseif( a>=‘a‘&&a<=‘z‘){ putchar (a-32);}else puts("error");}#include<stdio.h>int main(int argc,constchar*argv[]){int i =0, count_ji =0, count_ou =0, num_ji =0, num_ou =0;while(1){if(scanf("%d",&i)!=1){ puts("error");return-1;}if(i ==0){ puts("end");break;}if(i %2){ count_ji++; num_ji += i;}else{ count_ou++; num_ou += i;}}if(count_ji !=0){ num_ji /= count_ji;}if(count_ou !=0){ num_ou /= count_ou;} printf("count_ji = %d, count_ou = %d\n",count_ji, count_ou); printf("平均值_ji = %d, 平均值_ou = %d\n",num_ji, num_ou);return0;}int a =3;int i=0,j=0;float sum_ji=0;float sum_ou=0;while(1){if( scanf("%d",&a)!=1){return-1;}elseif(a==0){ puts("end");break;}if(a%2==0){ i++; sum_ou+=a;}else{ j++; sum_ji+=a;}} printf("%d %d\n",i,j);if(i!=0){ printf("%f\n",sum_ou);}if(j!=0){ printf("%f\n",sum_ji);}#endifint a;int xiaoshi=0,fen=0;while(1){if(scanf("%d",&a)!=1){ printf("try again!"); getchar();continue;}else{ xiaoshi=a/60; fen= a%60; printf("%02d:%02d\n",xiaoshi,fen);}}return0;}
# include <stdio.h>int main(int argc,constchar*argv[]){/* int i=0; int sum =0; for( i=0;i<=10;i++) { sum+=i; } printf("%d\n",sum); */int a,b,i,j;for(i=1;i<=9;i++){for(j=1;j<=i;j++){ printf("%-2d*%-2d=%-2d ",j,i,i*j);} putchar(10);}return0;}int i ;int bai,shi,ge;for(i=100;i<=999;i++){ ge = i%10; shi=i/10%10; bai=i/100;// printf("%d\n%d\n%d\n",ge,shi,bai);if(i==ge*ge*ge+shi*shi*shi+bai*bai*bai) printf("%d\n",i);}
int i,j,h;for(i=1;i<7;i++){for(j=i;j>=1;j--){ printf("_");}for(h=0;h<i;h++){ printf("%c",‘F‘-h);} putchar(10);}return0;}int i ,j;for(i=2;i<100;i++){for(j=2;j<=i;j++){if(( i%j==0)&&(i!=j))break;if(i==j) printf("%d\n",i);}}# include <stdio.h>int main(int argc,constchar*argv[]){int nian,yue,ri;int flag =1;int sum=0;while(1){ puts("please input:");if(scanf("%d %d %d",&nian,&yue,&ri)!=3){ puts("input error,try again:"); getchar(); getchar(); getchar();continue;}if((nian<0||nian>=9999)||0>yue||yue>12){ puts("输入错误！请重新输入");continue;}//判断输入到数字是否合理if(yue==1||yue==3||yue==5||yue==7||yue==8||yue==10||yue==12){if(0>ri||ri>31){ puts("日输入错误！请重新输入");continue;}}if(yue==4||yue==6||yue==9||yue==11){if(ri>30){ puts("日输入错误！请重新输入");continue;}}{if((nian%4==0)&&(nian%100!=0)||nian%400==0){ flag=1;if(yue==2)if(ri<0||ri>29){ puts("日输入错误！请重新输入");continue;}}else{if(yue==2)if(ri<0||ri>28){ puts("日输入错误！请重新输入");continue;} flag=0;}}switch(yue-1){case11:sum+=30;case10:sum+=31;case9:sum+=30;case8:sum+=31;case7:sum+=31;case6:sum+=30;case5:sum+=31;case4:sum+=30;case3:sum+=31;case2:{if(flag)sum+=29;else sum+=28;}case1:sum+=31;} printf("%d\n",sum+ri); sum=0;}return0;}标签：
原文地址：http://www.cnblogs.com/zhangfeionline/p/5869503.html
