C语言程序设计实验-答案

1-前言-/*非常感谢度娘以及各位网上C语言高手的支持，才能让敝人完成此文档的整理。本文档集合了本人、度娘、众网友的力量，其中代码的正确率约为90%（不正确的有标注）。为回报度娘及众网友的帮助，本文档免费下载。*//*配“电子科技大学出版社（周信东主编）”的C语言程序设计实验*//*努力吧，骚年以及学妹们！*//*整理edby口玉刀一ofGUET.*/=====================实验一C语言程序初步=====================1.----------------------------已知a=5,b=4,c=6,求出s并换行#includestdio.hmain(){inta,b,c,s;a=5;b=4;c=6;s=(a+b+c)/3;printf(a=%d,b=%d,c=%d\n,s=%d,a,b,c,s);}2.-------------------------------输入一个数字求他的平方#includestdio.hmain(){intr,s;scanf(%d,&r);s=r*r;printf(s=%d\n,s);}3.--------------------------------（1）#includestdio.hmain(){printf(*\n);printf(***\n);printf(*\n);}（2）#includestdio.h2main(){intv;inta,b,c;//a,b,caersides,visvolumeofcubea=3;b=3;c=5;v=a*b*c;printf(v=%d\n,v);}=================================实验二数据类型、运算符和表达式=================================1.（1）--------------------------------------------------//总觉得打印结果怪怪的，DOYOUTHINKSO?main(){chars1='3',s2='4',s3='5';intc1=101,c2=102;printf(3%c\t4%c\t5%c\n,s1,s2,s3);//3%c为输出3和%cprintf(s1=%d\ts2=%d\ts3=%d\n,s1,s2,s3);//注意哦，s1,s2,s3是char!而%d：输入输出为整形%ld长整型%hd短整型%hu无符号整形%u%lu%s:输入输出为字符串%c字符%f：输入输出为浮点型%lf双精度浮点型printf(c1=%d\t~%c\n,c1,c1);//换码符'\t',表示水平制表位（horizeontaltab）,它的作用是将光标移到最接近8的倍数的位置printf(c2=%d\t~%c\n,c2,c2);//注意c1,c2的类型}（2）//运行结果为8.300000%是求余数先运算x-y，把结果转换为int型的有利于四则运算main(){floatx=8.3,y=4.2,s;inta=7;s=x+a%5*(int)(x-y)%2/3;printf(s=%f,s);}3（3）main(){inti,j,p,q;i=3;j=6;p=i++;q=--j;printf(%d,%d,%d,%d\n,i,j,p,q);p=i--+3;q=++j-4;printf(%d,%d,%d,%d,i,j,p,q);}（4）main(){intm=15,n=9,s;m*=3+2;printf(%d,m);n+=n-=n*=n;printf(%d,n);printf(%d\n,(s=6*5,m+n+s));printf(%d\n,s);}2.----------------------------------------------------（1）#includestdio.h#defineMM40main(){inta=3,b=6,t;t=MM/(3+6);printf(%d%d,t,MM);}//原来printf语句打成了print，printf语句中少了一个%d.（2）#includestdio.h4main(){intm;doublex;scanf(%d,&m);x=3.14*m*m;printf(%f,x);}//注意分号，%f转义（3）main(){intm=8,n=5;printf(%d,m*=m-n);printf(%d,%d,%d,m=m+1,n-1,m+n);}3.----------------------------------------------------main(){inta=9,b=5;a+=b;b=a-b;a-=b;printf(%d%d,a,b);}4.----------------------------------------------------//4.输入a,b,c三个变量，计算数学公式(a*b)/cmain(){inta,b,d;floats,c;scanf(%d%d%f,&a,&b,&c);d=a*b;s=d/c;printf(%f,s);}5=================================实验三顺序结构和输入输出方法=================================1.---------------------------------------------------（1）main(){intm=345,t;floatn=2.56;t=2.56*100;printf(m=%d,n*100=%d\n,m,t);}（2）main(){inta,b,c,s,v;scanf(%d%d%d,&a,&b,&c);s=a*b;v=a*b*c;printf(%d,%d,%d\n,a,b,c);printf(s=%d,v=%d\n,s,v);}2.----------------------------------------------------（1）main(){intm,n;floatx=3.5,y=6.2;scanf(%d,%d,&m,&n);printf(%6d,%6d,m,n);/*每个数的输出宽度为6,两个数之间逗号建个。*/printf(x=%7.2f,y=%7.2f,x,y);/*个数的输出宽度7,小数位2*/}6（2）main(){inta,b;longm,n;floatp,q;scanf(a=%d,b=%d\n%f,%f,&a,&b,&p,&q);scanf(%ld,&m);scanf(%ld,&n);printf(a=%d,b=%d\nm=%ld,n=%ld\n,a,b,m,n);printf(p=%f,q=%f\n,p,q);}//打印结果有误！！3.----------------------------------------------------main(){inti,j,k,ss,m=1,n=1;scanf(%d%d,&i,&j);m+=i++;n*=--j;ss=(k=m+2,n-5,k+n);printf(%d,ss);}4.----------------------------------------------------#includestdio.hmain(){charc1,c2;c1=getchar();c2=getchar();putchar(c1);putchar(c2);printf(c1=%c,c2=%c,c1,c2);printf(%d.%d\n,c1,c2);}75.---------------------------------------------------#includestdio.hmain(){inta=790,b,c;b=790/60;c=790%60;printf(%d小时%d分钟,b,c);}6.---------------------------------------------------#includestdio.hmain(){inta,b,c,d;scanf(%d%d%d,&a,&b,&c);d=a;a=c;c=b;b=d;printf(%d,%d,%d\n,a,b,c);}7.--------------------------------------------------#includestdio.hmain(){doublea;scanf(%lf,&a);printf(%.2f\n,a);}8=================================实验四逻辑运算判断选取控制=================================1.---------------------------------------------------1.a.错误原因分析：Switch分号错误switch(a*a+b*b){case3:case1:y=a+b;break;case0:y=b-a;break;}b.错误原因分析：switch语句使用错误，后跟括号。Default放在后边。switch(a){case10:y=a-b;break;case11:x=a*b;break;default:x=a+b;}c.错误原因分析：没有输出语句。switch(a+b){case10:x=a+b;break;case11:y=a-b;break;}2.----------------------------------------------------（1）main(){intx,y;scanf(%d,&x);if(x-5&&x0)y=x;if(x==0)y=x-1;if(x0&&x10)y=x+1;printf(%d,y);}(2)main(){intx,y;scanf(%d,&x);if((x-5)&&(x0))y=x;elseif(x==0)y=x-1;elseif(x0&&x10)y=x+1;printf(%d,y);}3.----------------------------------------------------main(){inta,M;scanf(%d,&a);9M=a0?a:-a;printf(abs(a)=%d,M);}4.----------------------------------------------------main(){intc,t,m;printf(inputthenumberofcoatandtrousersyourwantbuy:\n);scanf(%d%d,&c,&t);if(c==t)if(c=50)m=c*80;elsem=c*90;elseif(ct)if(t=50)m=t*80+(c-t)*60;else90*t+(c-t)*60;elseif(c=50)80*t+(t-c)*45;elsem=c*90+(t-c)*45;printf(%d,m);}5.---------------------------------------------------#includestdio.hintmain(void){inta,b,c;scanf(%d%d%d,&a,&b,&c);if(a+b=c||a+c=b||b+c=a)printf(不构成三角形\n);elseif(a==b&&b==c)printf(等边三角形\n);elseif(a==b||b==c||a==c)printf(等腰三角形\n);elseprintf(不等边三角形\n);return0;}106.--------------------------------------------------#includestdio.hmain(){longa;scanf(%ld,&a);if(a%5==0)if(a%7==0)printf