简单易懂的C语言源代码(供初学者使用).doc

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1、#includemain(){floatpi=3.14159265,r;    printf("enterradius:");    scanf("%f",&r);    printf("r=%.2f,c=%.2f,area=%.2f",r,2*pi*r,pi*r*r);    system("pause");}#includemain(){intm,n,x,y;printf("inputm,n:");scanf("%d%d",&m,&n);if(n%2==1){print

2、f("error!!nbushijishu!",n);return;}/*n在这里不能是奇数*/x=(4*m-n)/2;y=(n-2*m)/2;if((x>=0)&&(y>=0))  printf("x=%d,y=%d",x,y);elseprintf("shurucuowu!");getch();}#include#include#includemain(){floata,b,C;printf("enter3number(a,b,C):");

3、scanf("%.2f%.2f%.2f",&a,&b,&C);s=0.5*a*b*sinC;printf("s=%.2f",s);system("pause");}#includemain(){intds,nl,yf;charc;printf("shuruds;");scanf("%d",&ds);if(ds<14

4、

5、ds>1184){printf("inputerror!pressanyend...");scanf("%c",&c);exit(0);}/*输入的数字必须是-14~11

6、84之间*/nl=(ds+115)%100;yf=(ds+115)/100;printf("nl=%d,yf=%d",nl,yf);system("pause");}#include#includemain(){chars1[100],s2[100],s3[100],s4[100];printf("inputastring:");gets(s1);strcpy(s1,s2);strcat(s1,"--------------");strcpy(s3,strcat(s1,"--

7、------------"));strcat(strcpy(s3,strcat(s1,"--------------")),s2);strcpy(s4,strcat(strcpy(s3,strcat(s1,"--------------")),s2));puts(s4);system("pasue");getch();}#include#includemain(){floatx1,x2,a,b,c;printf("input3number(a,b,c):");scanf("%f%f%f"

8、,&a,&b,&c);x1=(-b+sqrt(b*b-4*a*c))/(2*a);x2=(-b-sqrt(b*b-4*a*c))/(2*a);printf("x1=%f,X2=%f",x1,x2);system("pause");getch();}#includemain(){inta,b,c,t;printf("input3number:");scanf("%d%d%d",&a,&b,&c);if(a>b){t=a;a=b,b=t;}if(a>c){t=a;a=c;c=t;}if(b>c

9、){t=b;b=c;c=t;}printf("1:%d,2:%d,3:%d",a,b,c);    system("pause");}#include#include#includemain(){floatpi=3.14159265,r;textbackground(YELLOW);/*设置背景色为黄色，注意颜色应该大写，可更改*/textcolor(RED);/*设置文件颜色为红色，可更改*/clrscr();/*清屏，使设置生效*/printf("enter

10、radius:");scanf("%f",&r);if(r<0)printf("EnterError!