C语言作业总结(简单入门)_免费下载.doc

一元二次方程求解#include #include void main() int a,b,c;double x1,x2;scanf(%d,%d,%d,&a,&b,&c);if(b*b-4*a*c0) x1=(-b-sqrt(b*b-4*a*c)/2/a;x2=(-b+sqrt(b*b-4*a*c)/2/a;printf(%lf,%lf,x1,x2);else if(b*b-4*a*c=0)x1=x2=(-b-sqrt(b*b-4*a*c)/2/a;printf(%lf,%lf,x1,x2);else printf(无解); 分段函数#include void main () int x,y; printf(请输入一个数：); scanf(%d,&x); if(x1) y=x; else if(x10) y=2*x-1; else y=3*x-1; printf(x=%dn,y=%dn,x,y);某月多少天（switch）#include void main() int year,month; printf(请输入年份:); scanf(%d,&year); printf(请输入月份:); scanf(%d,&month); switch(month) case 1: case 3: case 5: case 7: case 8: case 10: case 12:printf(31天n);break; case 4: case 6: case 9: case 11:printf(30天n);break; case 2:if(year%4=0&year%100!=0|year%400=0) printf(29天n); else printf(28天n);break;最少运费应用题（switch）#include void main()int k,s; float p,w,d,f; printf(请输入距离(km):);scanf(%d,&s);printf(请输入单价($):);scanf(%f,&p);printf(请输入货物重量(kg):);scanf(%f,&w);if(s3000)k=12;else k=s/250;switch (k) case 0:d=0; break; case 1:d=2; break;case 2:case 3:d=5; break;case 4:case 5:case 6:case 7:d=8; break;case 8:case 9:case 10:case 11:d=10; break;case 12:d=15; break; f=p*w*s*(1-d/100);printf(%f,f);水仙花数163页#include void main() int m,i,j,k; m=100; while(m=999) i=m/100; j=(m-100*i)/10; k=m-100*i-10*j; if(m=i*i*i+j*j*j+k*k*k) printf(%dn,m); m+; 及格的成绩输出 例一15页#include void main() int n; float score; n=1; printf(请输入10个学生的成绩：n); while (n=60) printf(%.1fn,score); n+; 输出8个数中最大数 例三16页#include void main() int x,max,i; i=1; printf(请输入8个整数：n); scanf(%d,&x); max=x; while (i=max)max=x;i+; printf(最大数是:%d,max);统计字符串中的各元素个数83页第十题#include void main() char c; int letters=0,space=0,digit=0,other=0; printf(请输入字符串：n); while(c=getchar()!=n); if(c=a&c=A&c=0&c=9) digit+; else other+; printf(字母:%d,空格:%d,数字:%d,其他字符:%d,letters,space,digit,other);4/3，7/4，11/7，18/11前18项求和#include void main()int t,n;float a,b,sum,x;sum=0; a=4; b=3; x=4/3;for(n=1;n=18;n+)sum+=x;t=a;a=a+b;b=t;x=a/b;printf(%fn,sum);a+aa+aaa+aaaa=#include void main() int i,n,a; long int s=0,t=0; printf(请输入a,n:n); scanf(%d%d,&a,&n); for(i=1;i=n;i+) t=t+a; s=s+t; a=a*10; printf(a+aa+aaa+.=%ldn,s);输出10到100的素数#include void main()int i,n;for(n=10;n=100;n+)for(i=2;in;i+) if(n%i=0) break; if(i=n) printf(%dn,n);分数储存（一维数组）#include void main()int i,score39,sum;float aver;sum=0;for(i=0;i=38;i+)scanf(%d,&scorei);sum+=scorei;aver=sum/39.0; for(i=0;i=aver)printf(%d,scorei);分数储存（二维数组）#include void main() int score53,i,j,s=0; double aver5; for(i=0;i=4;i+)for(j=0;j=2;j+)scanf(%d,&scoreij); s+=scoreij;averi=s/3.0;s=0; for(i=0;i=4;i+)printf(%4f,averi);冒泡法对8个数降序#include void main() int i,j,a8,t; printf(请输入8个数：n); for(i=0;i7;i+)scanf(%d,&ai);for(j=0;j7;j+)for(i=0;i7-j;i+)if(aiai+1)t=ai+1;ai+1=ai;ai=t;printf(排列后的数组：n);for(i=0;i7;i+)printf(%4d,ai);选择法对8个数升序#include void main()int a8,i,j,k,x;printf(请输入8个数:n);for(i=0;i8;i+)scanf(%d,&ai);printf(n);for(i=0;i7;i+)k=i;for(j=i+1;j8;j+)if(ajak) k=j;if(k!=i)x=ai;ai=ak;ak=x;printf(排序后的数组:n);for(i=0;i8;i+)printf(%4d,ai);计算字符串长度#include #include void main()char a20;int i=0;printf(请输入字符串:n);gets(a);while(ai!=0)i+; printf(字符串的长度为：%dn,i);合并两字符串#include void main()char i,j,a80,b40;gets(a);gets(b); i=0;while(ai!=0) i+; j=0;while(bj!=0) ai=bj; i+; j+;ai=0;puts(a);字符串输出1#include void main()char *p=hello world;p=p+3;printf(%s0,p);字符串输出2#include void main()char a=hello world,*p=a;p=p+3;*p=A;printf(%sn,p);字符串粘贴#include #include void main()char a80,b80;char *stra,*strb;stra=a;strb=b;gets(a);while(*stra!=0) *strb=*stra;stra+,strb+;*strb=0;puts(b);字符串连接#include #include void main()char a80,b80;char *stra,*strb;stra=a;strb=b;gets(a); gets(b);while(*stra!=0) stra+;while(*strb!=0)*stra=*strb;stra+,strb+;*stra=0;puts(a);结构体#include void main()struct classmentchar name20;int age;char sex;char gf20;char child20;cla1; cla1.age=21; cla1.sex=M;printf(input name and gf and child:n );scanf(%s%s%s,&,&cla1.gf,cla1.child);printf(name=%snage=%dnsex=%cngf=%snchild=%sn,,cla1.age,cla1.sex,cla1.gf,cla1.child);结构体数组#include void main()struct employeechar name15;char sex;int age;float salary;emp3=zhou xuan,m,21,1.2,zhou jian ye,m,21,1.4,zhen li jie,m,21,1.6;int i;float s=0;for(i=0;i3;i+)s+=empi.salary;printf(s=%fn,s);指针访问结构体#include void main()struct employeechar name15;char sex;int age;float salary;emp1=zhou xuan,m,21,2000;struct employee *pemp;pemp=&emp1;printf(name=%sn,(*pemp).name);指针访问结构体数组#include void main()struct employeechar name15;char sex;int age;float salary;emp3=zhou xuan,m,21,200,zhou jian ye,m,21,1000,zhen li jie,m,21,1600;struct employee *peme;for(peme=emp;pemeemp+3;peme+)printf(name=%sn,(*peme).name);定义函数判断素数#include int fac(int n)int i,flag;for(i=2;in;i+)if(n%i=0) break;if(i=n) flag=1;else flag=0;return(flag);void main()int m;printf(请输入一个非零自然数：n);scanf(%d,&m);if(fac(m)=1)printf(该数为素数);else printf(该数为非素数);定义函数最大公约数和最小公倍数#include int zhao(int a,int b)int z,i;if(ab)for(i=b;i=1;i-)if(a%i=0&b%i=0)z=i; break;elsefor(i=1;id)for(j=c;j=c*d;j+)if(j%c=0&j%d=0)t=j; break;elsefor(j=d;j=c*d;j+) if(j%c=0&j%d=0)t=j; break; return(t);void main() int m,n,x,y; printf(请输入两个正整数：n); scanf(%d%d,&m,&n); x=zhao(m,n); y=xiang(m,n); printf(最大公约数=%d最小公倍数=%d,x,y);输入成绩，输出各行的平均分#include void main()int i,j,sco53;int s=0,ave5;for(i=0;i5;i+)for(j=0;j3;j+)scanf(%d,&scoij);s=s+scoij;avei=s/3;s=0; for(i=0;i5;i+)printf(%dn,avei);定义函数计算x的平方再求其阶乘（函数嵌套）#include int fun1(int p);int fun2(int p);int fun1(int p)int z,x;z=p*p;x=fun2(z);return(x);int fun2(int p) int j,z=1;for(j=1;j=p;j+)z=z*j;return(z);void main() int i,sum=0; for(i=2;i=3;i+