C语言必考100题(2)

}

2.#include main() { } 3.

#include #include main() { }

4.

#include #define PI 3.14 main() {

float r,c,area;

printf(\float a,b,c,area,t;

printf(\请输入a,b,c:\scanf(\t=1.0/2*(a+b+c);

if(a+b>c&&a+c>b&&b+c>a) {

area=sqrt(t*(t-a)*(t-b)*(t-c)); printf(\int a,b,ret;

printf(\ret=scanf(\if(ret!=2) { printf(\输入类型错误\\n\ } else { }

printf(\fflush(stdin);

} else printf(\不构成三角形\

} 5.

scanf(\

c=2*PI*r; area=PI*r*r;

printf(\

#include main() { } 6.

#include main() { }

7.

#include #include void main() {

float a,b,c,dlt; printf(\请输入a,b,c:\

scanf(\dlt=b*b-4*a*c;

int a,count=1;

printf(\请输入一个数字：\scanf(\while(a>=10) { a=a/10;

count++; }

printf(\这个数是%d位数\\n\int k,a,b,c;

printf(\scanf(\a=k/100; b=(k-a*100)/10; c=k;

printf(\return 0;

if(dlt>=0)

{ printf(\} else {

printf(\

printf(\

printf(\ } }

8.

#include

#include

void f1(float a,float b,float c) { }

void f2(float a,float b,float c) { float x; }

x=-b/2*a; float x1,x2,dlt; dlt=b*b-4*a*c;

printf(\

void f3(float a,float b,float c) { float x1,x2,dlt; dlt=b*b-4*a*c;

printf(\printf(\

printf(\}

main() {

float a,b,c,dlt;

printf(\请输入a,b,c:\

scanf(\dlt=b*b-4*a*c; if(dlt>0) { }

f1(a,b,c);

}

else if(dlt=0) { f2(a,b,c); } else { }

f3(a,b,c);

9.

#include main() {

int yourAge,hisAge;

printf(\scanf(\

printf(\ scanf(\

if(yourAge>=hisAge) {

printf(\} else {

printf(\

} } 10.

#include main() {

int y;

printf(\请输入年份：\

scanf(\ if((y%4==0&&y0!=0)||(y@0==0)) printf(\是闰年\\n\ else printf(\不是闰年\\n\}

11.

#include

main() {

float h,w,t;

printf(\请输入你的身高和体重（身高单位为米，体重单位为kg）：\scanf(\t=w/(h*h);

if(t<18) printf(\低体重\\n\

else if((t<25)&&(t>=18)) { printf(\正常体重\\n\ }

else if((t>=25)&&(t<27)) } 12.

#include

main() { int score,mark; printf(\请输入分数:\

scanf(\mark=score/10; switch(mark) {

case 10:

case 9:printf(\case 8:printf(\{

printf(\超重体重\\n\

}

else printf(\肥胖\\n\

case 7:printf(\ case 6:printf(\ case 5:

case 4: case 3:

case 2: case 1: }

case 0:printf(\default:printf(\}