C語言實驗報告三

（1）設(shè)計程序驗證關(guān)系運(yùn)算和邏輯運(yùn)算。（2）設(shè)計程序，從屏幕上輸入三個整數(shù)，求三個數(shù)中的最大數(shù)。源代碼：#include<stdio.h>intmain(){inta,b,c,max;printf("inputabc=");scanf("%d%d%d",&a,&b,&c);if(a>b){max=a;}elseif(b>c){max=b;}elsemax=c;printf("max=%d\n",max);return0;}運(yùn)行結(jié)果：（3）設(shè)計程序，輸入1000-2000之間的任意年份，判斷其是否為閏年。源代碼：#include<stdio.h>intmain(){intyear;printf("enteryear:");scanf("%d",&year);if(year>=1000&&year<=2000){if((year%4==0&&year%100!=0)||year%400==0){printf("Theyearisaleapyear\n");}else{printf("Theyearisnotaleapyear\n");}}else{printf("Theyearisoutoftherange\n");}return0;}運(yùn)行結(jié)果：（4）利用Switch語句設(shè)計程序，輸入1-7之間數(shù)字，打印輸出英文對應(yīng)的星期一-星期日。輸入其他數(shù)字，打印錯誤信息。源代碼：#include<stdio.h>intmain(){intnum;printf("inputnum=");scanf("%d",&num);switch(num){case1:printf("Monday\n");break;case2:printf("Tuesday\n");break;case3:printf("Wednesday\n");break;case4:printf("Thursday\n");break;case5:printf("Friday\n");break;case6:printf("Saturday\n");break;case7:printf("Sunday\n");break;default:printf("enterweekerror!\n");}return0;}運(yùn)行結(jié)果：（5）某商場實行打折促銷活動，購物金額<300，不打折；300<=購物金額<500，9折；購物金額>=500，7折。設(shè)計程序，要求輸入購物金額，計算實際應(yīng)支付金額。源代碼：#include<stdio.h>intmain(){floata,b;printf("inputa:");scanf("%f",&a);if(a<300){b=a;printf("b=%.2f\n",b);}if(a>=300&&a<=500){b=a*0.9;printf("b=%.2f\n",b);}if(a>500){b=a*0.7;printf("b=%.2f\n",b);}return0;}運(yùn)行結(jié)果：（6）設(shè)計程序，從屏幕輸入字符，如果是大寫字母轉(zhuǎn)換小寫輸出，如果是小寫字母轉(zhuǎn)換大寫輸出，其他字符原樣輸出。源代碼：#include<stdio.h>intmain(){charc;printf("inputc:");scanf("%c",&c);if(c>='A'&&c<='Z'){c+=32;printf("%c\n",c);}elseif(c>='a'&&c<='z'){c