2.2*includemain(){float *=2.5,y=2.5,z=2.5;printf("*=%f\n",*);printf("y=%f\n",y);printf("z=%f\n",z);}3.1(1) *includemain(){int a=12,b=3;float *=18.5,y=4.6;printf("%d\n",(float)(a*b)/2);printf("%d\n",(int)*%(int)y);}3.2*includemain(){int *,b0,b1,b2,s;printf("Input*:");scanf("%d",&*);b2=*/1;b1=(*-b2*1)/10;b0=*%10;s=b0*1+b1*10+b2;printf("s=%d\n",s);}3.3*include*includemain(){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*include*includemain(){float a,b,c;double *,y;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);*=(-b+sqrt(b*b-4*a*c))/(2*a);y=(-b-sqrt(b*b-4*a*c))/(2*a);printf("*=%f,y=%f\n",*,y);}4.1(1) *includemain(){char c1='a',c2='b',c3='c';printf("a%cb%cc%c\n",c1,c2,c3);}4.1(2) *includemain(){int a=12,b=15;printf("a=%d%%,b=%d%%\n",a,b);}4.1(3) *includemain(){int a,b;scanf("%2d%*2s%2d",&a,&b);printf("%d,%d\n",a,b);}4.2 *includemain(){long a,b;float *,y;scanf("%d,%d\n",&a,&b);scanf("%f,%f\n",&*,&y);printf("a=%d,b=%d\n",a,b);printf("*=%f,b=%f\n",*,y);}5.1 *includemain(){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 *includemain(){int a;printf("Inputa:");scanf("%d",&a);if(a%2==0){printf(是偶数");}else{printf(是奇数");}}5.3 *include*includemain(){float a,b,c,s,area;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a+b>c&&a+c>b&&b+c>a){s=(a+b+c)/2;area=(float)sqrt(s*(s-a)*(s-b)*(s-c));printf("area=%f\n",area);}else{printf 即是三角形");}}5.4 *include*includemain(){float a,b,c,*,y;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a==0){printf 诙方程不是一元二次方程\n");}if(b*b-4*a*c>0){*=(-b+sqrt(b*b-4*a*c))/(2*a);y=(-b-sqrt(b*b-4*a*c))/(2*a);printf("*=%f,y=%f\n",*,y);}else if(b*b-4*a*c==0){*=-b/(2*a);y=-b/(2*a);pri...
