C语言习题集及答案 1(12)

山东大学C语言考试试题练习

main()

{ float a,b,c,d,pr,pi,x1,x2; scanf("%f%f%f",&a,&b,&c);

printf("a=%f,b=%f,c=%f\n",a,b,c); if(a==0)

{ if( (1) )

printf("only one solution x=%f\n",-c/b); else

if( (2) )printf("no solution\n"); else printf("x is any value\n"); } else

{ d=b*b-4*a*c; if( (3) )

{ x1=(-b+sqrt(d))/ (4) ; x2=(-b-sqrt(d))/ (5) ;

printf("x1=%6.2f, x2=%6.2f\n",x1,x2); } else

{ pr=-b/(2*a); (6) ;

printf("x1=%6.2f +%6.2fi\n",pr,pi); printf("x2=%6.2f -%6.2fi\n",pr,pi); } } }

6． 投票表决器：

– 输入Y、y，打印agree – 输入N、n，打印disagree – 输入其他，打印lose

main()

{

char c;

scanf("%c",&c);