c语言期末上机考试复习题题答案

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1、C语言题目试编程完成如下功能：1.输入3个实数a,b,c要求按从大到小（或者从小到大）的顺序输出三数#includevoidmain(){floata,b,c,t;printf(“请输入三个数！”);scanf(“%f,%f,%f”,&a,&b,&c);if(a>=b){t=a;a=b;b=t;}if(b>=c){t=b;b=c;c=t;}if(a>=b){t=a;a=b;b=t;}printf(“%f%f%f”,a,b,c);}2.输入一个字符，如果是大写字母，则把其变

2、成小写字母；如果是小写字母，则变成大写字母；其它字符不变。#includevoidmain(){charc;printf(“请输入一个字符！”);scanf(“%c”,&c);if((c>=’A’)&&(c<=’Z’))c=c+32;elseif((c>=’a’)&&(c<=’z’))c=c-32;elsec=c;printf(“%c”,c);}3.读入a、b、c的值，计算一元二次方程ax2+bx+c=0的根。#include#include

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