#include<stdio.h>
#include<conio.h>
float trapezoidarea(void)
{
float length1,length2,high,area;
printf("enter length1 : ");
scanf("%f",&length1);
printf("enter length2 : ");
scanf("%f",&length2);
printf("enter high : ");
scanf("%f",&high);
area = (length1+length2)*high/2;
return(area);
}
main()
{
float area;
area = trapezoidarea();
printf("Area is %.2f\n",area);
getch();
}
p.23
#include<stdio.h>
#include<conio.h>
#include<math.h>
float mypow(float a)
{
float result;
result=a*a;
return(result);
}
float mysqu(float a)
{
float result;
result=sqrt(a);
return(result);
}
main()
{
float a,b,result;
while (1==1)
{
printf("enter number : ");
scanf("%f",&a);
printf("please select choice (1=power , 2=square root) : ");
scanf("%f",&b);
if (b=1)
{
result = mypow(a);
printf("result = %.6f",result);
}
else if (b=2)
{
result = mysqu(a);
printf("result = %.6f",result);
}
else
{
printf("menu error!!");
}
printf("\n***************\n");
}
getche();
}
p.27
#include<stdio.h>
#include<conio.h>
char cal_grade(float score);
main()
{
float score;
char grade;
printf("Enter score : ");
scanf("%f",&score);
grade = cal_grade(score);
printf("You get %c !!!",grade);
getch();
}
char cal_grade(float score)
{
char grade;
if (score>=80)
{
grade = 'A';
}
else if (score>=70&&score<80)
{
grade = 'B';
}
else if (score>=60&&score<70)
{
grade = 'C';
}
else if (score>=50&&score<60)
{
grade = 'D';
}
else if (score<50)
{
grade = 'F';
}
return(grade);
}
p.28
#include<stdio.h>
#include<conio.h>
float myaverage(void)
{
float a,b,average;
printf("Enter a : ");
scanf("%f",&a);
printf("Enter b : ");
scanf("%f",&b);
average = (a+b)/2;
return(average);
}
main()
{
float average;
average = myaverage();
printf("Average is %.2f\n",average);
getch();
}
ex.1
#include<stdio.h>
#include<conio.h>
int findmax(int n1,int n2);
main()
{
int num1,num2,ans;
printf("Enter number1 : ");
scanf("%d",&num1);
printf("Enter number2 : ");
scanf("%d",&num2);
ans = findmax(num1,num2);
printf("The max number is %d",ans);
getch();
}
int findmax(int n1,int n2)
{
int max;
if (n1 > n2)
{
max = n1;
}
else if (n2 > n1)
{
max = n2;
}
return(max);
}
