แบบฝึกหัดข้อที่ 1

#include<stdio.h>
#include<conio.h>
int findmax(int n1,int n2);
main()
{
      int n1,n2,ans;
      printf("Enter number1 : ");
      scanf("%d",&n1);
      printf("Enter number2 : ");
      scanf("%d",&n2);
     
      ans = findmax(n1,n2);
      printf("The max number is %d",ans);
      getch();
}
int findmax(int num1,int num2)
{
      int max;
          if (num1 > num2)
          {
                 max = num1;
          }
          else if (num2 > num1)
          {
                 max = num2;
          }
      return(max);
}

หน้า 28

#include<stdio.h>
#include<conio.h>
float myavg(void)
{
     float a,b,avg;
     printf("Enter a : ");
     scanf("%f",&a);
     printf("Enter b : ");
     scanf("%f",&b);
     avg = (a+b)/2;
     return(avg);
}
main()
{
      float avg;
      avg = myavg();
      printf("Average is %.2f\n",avg);
      getch();
}

หน้า 27

#include<stdio.h>
#include<conio.h>
char cal_grade(float score);
main()
{
      float s;
      char grade;
      printf("Enter score : ");
      scanf("%f",&s);
     
      grade = cal_grade(s);
      printf("You get %c !!!",grade);
     
      getch();
}
char cal_grade(float s)
{
      char grade;
      if (s>=80)
      {
                 grade = 'A';
      }
      else if (s<80&&s>=70)
      {
                 grade = 'B';
      }
      else if (s<70&&s>=60)
      {
                 grade = 'C';
      }
      else if (s<60&&s>=50)
      {
                 grade = 'D';
      }
      else if (s<50)
      {
                 grade = 'F';
      }
      return(grade);
}

หน้า 23

#include<stdio.h>
#include<conio.h>
#include<math.h>
float power(float n);
float sqroot(float n);
main()
{
      float n;
      int c;
     
      printf("Enter number : ");
      scanf("%f",&n);
      printf("Please select choice( 1=power, 2=square root) : ");
      scanf("%d",&c);
     
      if(c==1)
      {
             power(n);
            
      }
      else if(c==2)
      {
             sqroot(n);
            
      }      
      else
      {
             printf("Menu Error!!");
      }
     
     
     
    
      getch();
     
}
float power(float n)
{
       float mypow;
       mypow=pow(n,2);
       printf("Result = %.2f ",mypow);
       return(mypow);
}
float sqroot(float n)
{
       float mysqrt;
       mysqrt=sqrt(n);
       printf("Result = %.2f ",mysqrt);
       return(mysqrt);
}

หน้า 20

#include<stdio.h>
#include<conio.h>
#include<math.h>
float fouhtarea();
main()
{     
      float area;
      area=fouhtarea();
      printf("4angle area is %.2f\n ",area);
    
      getch();
}
float fouhtarea()
{
      float high,minlent,maxlent,area;
      printf("enter high : ");
      scanf("%f",&high);
      printf("enter minlent : ");
      scanf("%f",&minlent);
      printf("enter maxlent : ");
      scanf("%f",&maxlent);
     
      area=high*(minlent+maxlent)/2;
      return(area);
}