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1、演示1#include void print_star(void) printf(*n);void print_welcome(void) printf(C language,welcome!n);void main() print_star(); print_welcome(); print_star(); getchar();演示2#include stdio.hint sum(int i,int j) return(i + j);void main() int n1,n2; printf(input 2 numbers:n); scanf(%d%d,&n1,&n2); printf(th

2、e sum = %dn,sum(n1,n2); getchar();演示3#include stdio.hint maxnum(int,int,int);main() int a,b,c; printf(Please enter 3 numbers:n); scanf(%d,%d,%d,&a,&b,&c); printf(Maxnum is %dn,maxnum(a,b,c); return 0;int maxnum(int x,int y,int z) int max=x; if(ymax) max = y; if(zmax) max = z; return max;演示4#include

3、int s1(int n)int j,s; s=0; for(j=1;j=n;j+) s=s+j; return s;int sum(int n)int i,s=0;for(i=1;i=n;i+)s=s+s1(i);return s;void main()int n;printf(n:);scanf(%d,&n);printf(s=%dn,sum(n);演示5#include void func(int n)int i;for(i=n-1;i=1;i-)n=n+i;printf(n=%dn,n);void main()int n;printf(Input n:);scanf(%d,&n);fu

4、nc(n);printf(n=%dn,n);演示6#include void swap(int a,int b)int temp;temp=a;a=b;b=temp;printf(swap : a=%d,b=%dn,a,b);void main()int a,b;a=3;b=10;swap(a,b);printf(a=%d,b=%dn,a,b);演示7#include int func(int a,int b)int c;c=a+b;return c;void main()int x=6,y=7,z=8,r;r=func(x-,y+,x+y),z-);printf(%dn,r);演示8#inc

5、lude max(float x,float y)return xy? x:y;void main()printf(%dn,max(2,3.5);演示9#include int sum(int n)int i,s=0;for(i=0;i=n;i+)s=s+i;return s;void main() int m,sn; scanf(%d,&m); sn=sum(m); printf(the sum is %dn,sn);演示10#include void swap(int x,int y);int main() int a,b; printf(input 2 numbers :n); scan

6、f(%d,%d,&a,&b); printf(input number is:a=%d,b=%d n,a,b); swap(a,b); printf(input 2 numbers is:a=%d,b=%dn,a,b); return 0;void swap(int x,int y) int temp; temp = x; x = y; y = temp; printf(swap number is : x = %d,y = %d n,x,y);演示11#include stdio.h#define K 3#define N 5long f2(int n,int k) long power =

7、 n; int i; for(i=1;ik;i+) power *=n; return power;long f1(int n,int k) long sum = 0 ; int i; for(i=1;i=n;i+) sum = sum + f2(i,k); return sum;int main(void) printf(sum of %d power of integer from 1 to %d = ,K,N); printf(%ldn,f1(N,K); return 0;演示12#include int min(int a,int b);int main(void) int j,k,m

8、ininum; printf(input 2 integers:); scanf(%d,%d,&j,&k); mininum = min(j,k); printf(n of the two values %d and %d,the mininum is %dn,j,k,mininum); return 0;int min(int a,int b) if(ab) return a; else return b;演示13#include int func(int a,int b);void main() int k=4,m=1,p;p=func(k,m); printf(%dn,p);int fu

9、nc(int a,int b) int m=0,i=2; i+=m+1; m=i+a+b; return m;演示14#include int max(int x,int y)int z;z=xy?x:y;return z;void main()extern int A,B; /聲明外部變量printf(%dn,max(A,B);int A=13,B=-8; /定義外部變量演示15#include int f1(int xb) extern int xa; return (xa*xb);int main(void) extern int xb; int xa = 5; printf(xa=%d

10、,xb=%d,result=%d,xa,xb,f1(xa); return 0;int xa = 3,xb = 4;演示16#include void num()extern int x,y;int a=15,b=10;x=a-b;y=a+b;int x,y;void main()int a=7,b=5;x=a+b;y=a-b;num(); printf(%d,%dn,x,y);演示17#include void main() void swap(); extern int a,b;a=3;b=10;swap();printf(a=%d,b=%dn,a,b);int a,b;void swap

11、()int temp;temp=a;a=b;b=temp;演示18#include void auto_static(void) int var_auto = 0; static int var_static = 0; printf(var_auto = %d,var_static = %dn,var_auto+,var_static+);void main() int i; for (i=0;i3;i+) auto_static();演示19#include void swap(int x,int y) int t; t=x;x=y;y=t; void main() int a,b; sca

12、nf(%d,%d,&a,&b); swap(a,b); printf(%d,%dn,a,b);-#include int x,y;void swap(int ，,int) int t; t=x;x=y;y=t; void main() scanf(%d,%d,&x,&y); swap(x,y); printf(%d,%dn,x,y);#include int x,y;void swap(int x,int y) int t; t=x;x=y;y=t; void main() scanf(%d,%d,&x,&y); swap(x,y); printf(%d,%dn,x,y);-演示20#incl

13、ude int fac(int n) static int f=1; f=f*n; return f;void main() int i; for(i=1;i=5;i+) printf(%d!=%dn,i,fac(i);演示21#include stdio.hint main(void) int a = 2; int p = a; printf(%dn,a); int a =7; printf(%dn,a); printf(%dn,p); printf(%dn,+a); return 0;演示22#include int func(int a,int b);void main() int k=

14、4,m=1,p;p=func(k,m);printf(%d,p);p=func(k,m);printf(%dn,p);int func(int a,int b) static int m=0,i=2; i+=m+1; m=i+a+b; return m;演示23#include f(int n)int c;if(n=6)c=1;elsec=(f(n+1)+1)*2;return c;void main() printf(%dn,f(1);演示24#include long power(int n) long f; if(n1) f=power(n-1)*n; else f=1; return

15、f;main() int n; long x; printf(input an integer number:n); scanf(%d,&n); x=power(n); printf(%d!=%ldn,n,x); getchar();演示25#include int fact()static int i=5;if(i=0) return 1;elsei-;return (i+1)*fact();void main() printf(fact=%dn,fact();演示26#include int fun(int k);int w=3;void main()int w=10;printf(%dn

16、,fun(5)*w);int fun(int k)if(k=0) return w;return(fun(k-1)*k);演示27#include int fac(int n) register int i,f=1; for(i=1;i=n;i+) f=f*i; return f;main() int i; for(i=1;i=5;i+) printf(%d!=%dn,i,fac(i);演示28#include age(int n) int c; if(n=1)c=10; else c=age(n-1)+2; return c;void main() printf(%dn,age(5);演示2

17、9#include #define PI 3.14#define circuit(r) 2*PI*r#define area(r) PI*r*rvoid main() float ra,c,a;scanf(%f,&ra);c=circuit(ra);a=area(ra);printf(ra=%f,c=%f,a=%f,ra,c,a);漢諾塔（演示30）#include stdio.hvoid move(int,char,char,char);int main(void) int n; printf(input n disk on tower A:n); scanf(%d,&n); move(n,

18、A,B,C); getchar(); return 0;void move(int n,char a,char b,char c) static int step=1; if(n=1) printf(step %d :move disk form %c - %cn,step+,a,c); else move(n-1,a,c,b); move(1,a,b,c); move(n-1,b,a,c); 演示31#define LETTER 1#include stdio.hvoid main()char str20=C Language,c;int i;i=0;while(c=stri)!=0)i+;#if LETTERif(c=a&c=A&c=Z)c=c+32;#endifprintf(%c,c);#include long f(int n)if(n=1|n=2)return 1;else return f(n-1)+f(n-2);void main()long n;printf(input n:n);scanf(%d,&n);printf(the number is %dn,f(n);