C语言程序设计苏小红版答案解析.doc

2.2 #includestdio.h main() { float x=2.5,y=2.5,z=2.5; printf(x=%f\n,x); printf(y=%f\n,y); printf(z=%f\n,z); } 3.1(1) #includestdio.h main() { int a=12,b=3; float x=18.5,y=4.6; printf(%d\n,(float)(a*b)/2); printf(%d\n,(int)x%(int)y); } 3.2 #includestdio.h main() { int x,b0,b1,b2,s; printf(Inputx:); scanf(%d,x); b2=x/100; b1=(x-b2*100)/10; b0=x%10; s=b0*100+b1*10+b2; printf(s=%d\n,s); } 3.3 #includestdio.h #includemath.h main() { float rate=0.0225; float n,capital,deposit; printf(Input n,capital:); scanf(%f,%f,n,capital); deposit=capital*pow(1+rate,n); printf(deposit=%f\n,deposit); } 3.4 #includestdio.h #includemath.h main() { float a,b,c; double x,y; printf(Inputa,b,c:); scanf(%f,%f,%f,a,b,c); x=(-b+sqrt(b*b-4*a*c))/(2*a); y=(-b-sqrt(b*b-4*a*c))/(2*a); printf(x=%f,y=%f\n,x,y); } 4.1(1) #includestdio.h main() { char c1=a,c2=b,c3=c; printf(a%cb%cc%c\n,c1,c2,c3); } 4.1(2) #includestdio.h main() { int a=12,b=15; printf(a=%d%%,b=%d%%\n,a,b); } 4.1(3) #includestdio.h main() { int a,b; scanf(%2d%*2s%2d,a,b); printf(%d,%d\n,a,b); } 4.2 #includestdio.h main() { long a,b; float x,y; scanf(%d,%d\n,a,b); scanf(%f,%f\n,x,y); printf(a=%d,b=%d\n,a,b); printf(x=%f,b=%f\n,x,y); } 5.1 #includestdio.h main() { float a; printf(Innputa:); scanf(%f,a); if(a=0) { a=a; printf(a=%f\n,a); } else { a=-a; printf(a=%f\n,a); } } 5.2 #includestdio.h main() { int a; printf(Inputa:); scanf(%d,a); if(a%2==0) { printf(a是偶数); } else { printf(a是奇数); } } 5.3 #includestdio.h #includemath.h main() { float a,b,c,s,area; printf(Inputa,b,c:); scanf(%f,%f,%f,a,b,c); if(a+bca+cbb+ca) { s=(a+b+c)/2; area=(float)sqrt(s*(s-a)*(s-b)*(s-c)); printf(area=%f\n,area); } else { printf(不是三角形); } } 5.4 #includestdio.h #includemath.h main() { float a,b,c,x,y; printf(Inputa,b,c:); scanf(%f,%f,%f,a,b,c); if(a==0) { printf(该方程不是一元二次方程\n); } if(b*b-4*a*c0) { x=(-b+sqrt(b*b-4*a*c))/(2*a); y=(-b-sqrt(b*b-