【白书】第一章习题

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#include <stdio.h>int main()
{int a = 0,b = 0,c = 0;float ave = 0;printf ("输入3个整数：");scanf ("%d %d %d",&a,&b,&c);ave = (float)(a + b + c) / 3;printf ("AVE = %.3f",ave);return 0;
}

#include <stdio.h>int main()
{float f = 0,t = 0;printf ("输入f：");scanf ("%f",&f);t = 5 *(f - 32) / 9;printf ("c = %.3f",t);return 0;
}

 

#include <stdio.h>int main()
{int n = 0,sum = 0;int i = 0;printf ("输入n：");scanf ("%d",&n);for (i = 1;i <= n;i++)sum += i;printf ("sum = %d",sum);return 0;
}

#include <stdio.h>
#include <math.h>int main()
{int n = 0;double i = 0;printf ("输入n：");scanf ("%d",&n);printf ("sin = %lf\ncos = %lf",sin(i),cos(i));return 0;
}

#include <stdio.h>
#include <math.h>int main()
{double s = 0,tmp = 0,x1 = 0,y1 = 0,x2 = 0,y2 = 0;printf ("输入(x1,y1) (x2,y2)：");scanf ("%lf %lf %lf %lf",&x1,&y1,&x2,&y2);tmp = (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);s = sqrt (tmp);printf ("s = %lf",s);return 0;
}

#include <stdio.h>int main()
{int n = 0;printf ("输入n：");scanf ("%d",&n);if (n % 2)printf ("no");elseprintf ("yes");return 0;
}

#include <stdio.h>int main()
{double n = 0;printf ("输入n：");scanf ("%lf",&n);if (n > 3)printf ("%.2lf",n * 95 * 0.85);elseprintf ("%.2lf",n * 95);return 0;
}

#include <stdio.h>int main()
{double n = 0;printf ("输入n：");scanf ("%lf",&n);if (n < 0)n = -n;printf ("%.2lf",n);return 0;
}

#include <stdio.h>int main()
{double a[3],tmp = 0;int i = 0,k = 0;printf ("输入a,b,c：");scanf ("%lf %lf %lf",&a[0],&a[1],&a[2]);for(i = 3;i > 0;i--)for (k = 1;k < i;k++){if (a[k - 1] >a[k]){tmp = a[k - 1];a[k - 1] = a[k];a[k] = tmp;}}if (a[0] * a[0] + a[1] * a[1] == a[2] * a[2])printf ("yes");elseprintf ("no");return 0;
}

#include <stdio.h>int main()
{int y = 0;printf ("输入year：");scanf ("%d",&y);if ((y % 4 == 0 && y % 100 != 0) || y % 400 == 0)printf ("yes");elseprintf ("no");return 0;
}

 

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