初學(xué)C語(yǔ)言常用簡(jiǎn)單程序代碼

1、初學(xué)C培言常用簡(jiǎn)單程序代碼素?cái)?shù)的篩選include <stdio.h>include <math.h>#define N 1000int main(int argc, char* argv)int i,j,numN);for(i=0;i<N;i+) numi=i+1;for(i=1;i<(int)sqrt(double)N);i+) if(numi)for(j=i+1 ;j<N;j+)if(numj)if(numj%numi=0) numj=0;for(i=1;i<N;i+)if(numi)printf(" %d",numi)

2、;return 0;輸出時(shí)分杪include <stdio.h>main()int x,s,t,d;scanf("%d",&x);s=x%60;t=(x/60)%60;d=(x/60)/60;printf(u%d Bt%d 分(1 杪；d,t,s);)三個(gè)數(shù)的交換include <stdio.h>void main()int a,b,c,t;scanf("%d%d%d",&a,&b,&c);printf("The original number:a=%d,b=%d,c=%dn",

3、a,b,c);t=a,a=b,b=t;t=a,a=c,c=t;printf("afterswap:a=%d,b=%d,c=%d",a,b,c);1switch語(yǔ)句的運(yùn)用include <stdio.h> main()int a,m;printf("please input a number:"); scanf("%d",&a);switch(a/1O)case 10:case 9: m=5; break;case 8: m=4; break;case 7:m=3;break;case 6:m=2;break;def

4、ault:m=1;Iprintf("m=%d",m);1圳斷奇數(shù)和偶數(shù)include <stdio.h>main()int x;printf("Please input a number:"); scanf("%d",&x);if(x%2=0)printff'this is a oushu!");elseprintf("this is a jishu!");)小寫改大寫,若是大寫則不變include <stdio.h>main()char c1,c2;printf(

5、"lnput a letternH);scanf("%c",&c1);c2=Ca<=c1 &&c1 <=,z,)?(c1 -,a,+,A,):c1; printf(,%c,c2);getchar();return 0;輸入一個(gè)數(shù)，輸出這f數(shù)是幾位數(shù)include <stdio.h>main()int x,n;prin廿("please input a number:"); scanf("%d",&x);n=O;while(x!=O)x=x/10;n+;!printf(&

6、quot;%d",n)；)輸入一個(gè)數(shù)，圳Bi它是幾位數(shù)，然后逆序輸出#include<stdio.h>int main()int num;int len =0;int temp =0;printf("Please input anu mberki");scanfC%d：&num);while(num %10)!=0)temp =temp*10+(num%10);len+;考試資料numnum/10;printfflength =%dn",len);printfC'Reverse is %d", temp); 扌J印水

7、仙花數(shù)include <stdio.h>main()int x, a,b,c;for(x=100;x<=999;x+)a=x%10;b=(x/10)%10;c=x/1OO;if(x=a*a*a+b*b*b+c*c*c)printf("%5d；x);Iprintf(,nu);判IO年include "stdio.h"main()int k,flag,n=0;for(k=1980;k<=2880;k+)f_agH(k%4so)20Q(k%oolro)=(k%400ssif(f_ag)(pintf(=%5d=mn+if(n%10£0)p

8、5-if(M)pB-mn)沁r3+57 99+1S3A#inc-udeAsidio.hvmam()ini SU3HsumurgfoTr-3=A匕2I:+2)(llAsum=sum+i*rp5-tf(=sum"%dsumr沁駕n IO#inc-udeAsidio.hvmam()foai SHint n,i,fz,fm;s=0;fz=2;fm=1;printf("Enter n:H);scanf("%d",&n);for(i=1;i<=n;i+)t=(1.0*fz)/fm;s=s+t;fz=fz+fm;fm=fz-fm;printf("

9、;s=%fnM,s);1開發(fā)一個(gè)程序求全冊(cè)學(xué)生某門課的平均成績(jī)，要求程序每次運(yùn)行時(shí)冊(cè)級(jí)人數(shù)可為任意廠用標(biāo)記值來(lái)指示數(shù)據(jù)輸入的結(jié)東*/include <stdio.h>main()float average,total;int counter,score;total=0.0;counter=0;printfC輸入成績(jī),-1表示結(jié)東門；scanf("%d",&score);while(score!=-1)廣用-1表示輸人的結(jié)東，同時(shí)循環(huán)輸入分?jǐn)?shù)*/total=total+score;counter+;printfC'lffl人下一個(gè)成績(jī)表示輸入結(jié)東:

10、”);scanf("%d",&score);if(counter!=0)average=total/counter;printf("全冊(cè)平均成績(jī)?yōu)?%.2fn”,average);elseprintf(u沒(méi)有輸人成績(jī)n");return 0;1求二元一次方程的根include <stdio.h>include <math.h>main()float a=4,b=-40,c=91;float x1,x2;float delta;delta=sqrt(b*b-4.0*a*c);x1=(-b+delta)/(2.0*a);x2=

11、(-b-delta)/(2.0*a);printfCx1=%f x2=%fnH,x1,x2);if培句的運(yùn)用include <stdio.h> main()int a,b,c,s,w,t;s=w=t=O;a=-1；b=c=3*if(c>0)s=a+b;if(a<=0)if(b>0)if(c<=0)w=a-b;elseif(c>0)w=a-b;elset=c;printf("s=%d, w=%d,t=%d",s,w,t); )輸入學(xué)生的生日，輸出他的實(shí)足年齡include <stdio.h>main()int y0,m0,

12、d0,y1,m1,d1,age; printf("nplease input birthday (yyyy/mm/dd):H); scanf(M%d/%d/%d M,&yO,&mO,&dO);printf("nplease input current day(yyyy/mm/dd):"); scanf(u%d/%d/%d "，&y1，&ml,&d1);if(m1>mO) | (m1=mO && d1>=dO) age=y1-yO;elseage=y1-yO-1;printf(&q

13、uot;age=%d n",age);)指針變量作為函數(shù)參數(shù)，實(shí)現(xiàn)兩數(shù)的交換include <stdio.h>void sswap(int *x,int *y);main()int a=10,b=20;printf("before swap:a=%d,b=% dn",a,b); sswap(&a,&b);printf("after swap:a=%d,b=%dn,a,b);)void sswap(int *x,int *y)int t;t=*x;*x=*y;*y=t;1通過(guò)函數(shù)調(diào)用輸出兩個(gè)實(shí)型數(shù)中最大的一個(gè)include &l

14、t;stdio.h>float *f(float *px,float *py)if(*px>*py)return px;return py;)main()float x=10.0,y=20.0,*a=&x,*b=&y; printf("*a=%f,*b=%f,max=%fn",*a,*b,*f(a,b);廿算并輸出一f數(shù)組中所有元素的和，最大值，最小值，值為奇數(shù)的 元素個(gè)數(shù)編寫一個(gè)函數(shù)，將一個(gè)字符串中的字符全部轉(zhuǎn)成大寫include <stdio.h>void Lower2Upper(char *str)char *p=str;whi

15、le(*p!=0)if(*p<=,z,&&*p>=,a,)*p=*p-32;P+；1main()chars10£Hello!"int i;Lower2Upper(s); for(i=0;i<10;i+)printf("%c",si);廿算一個(gè)字符在一個(gè)字符串中出現(xiàn)的次數(shù)include <stdio.h>int count(char ch,char *str)char *p=str;int num=O;while(*p!=,O,)if(*p+=ch)num+;return num;)main()char ah=

16、'a'char s="haowareayou" printf("the number is:");printf(,%dn",count(,a',s);刪除一維數(shù)組中所有相同的數(shù)#include <stdio.h>void unique(int *a,int *n)int k=1;int i,m;m=a0;for(i=0;i<*n;i+)if(ai>m)ak+=ai; m=ai;1I*n=k;1main()inta1O;int n=1O,i;printfC'input a list numb

17、er:"); for(i=0;i<n;i+) scanf("%d",&ai); printf("Before delete:.An");for(i=0;i<n;i+)unique(a,&n); printf("after delete.An"); for(i=0;i<n;i+) printfC%d：ai);printfCXn");考試資料將字符串按字典噸序輸出 include <stdio.h> include <string.h> #define N 5

18、void sort(char *name,int n);void prn(char *name,int n);void main()char *name=,China,J,'America","Australia","France",'German" sort(name,N);prn(name,N);void sort(char *name,int n)char *pt;int i,j,k;for(i=0;i<n-1;i+)k=i;for(j=i+1;j<n;j+)if(strcmp(namek,namej)>0) k=j；if(k!=i)pt=namei; namei=namek; namek=pt;void prn