1. WAP to get a character from the user until he enters vowel.

#include<stdio.h>
int main()
{
	char ch;
	while(1)
	{
		scanf("%c",&ch);
		if(ch=='a'||ch=='A'||ch=='e'||ch=='E'||ch=='i'||ch=='I'||ch=='o'||ch=='O'||ch=='u'||ch=='U')
			break;
	}
	return 0;
}

11. WAP to change the CAPS of characters i.e. if input character is in small the output will be in capital.

    #include<stdio.h>
    int main()
    {
    char ch;
    printf("Enter a character");
    scanf("%c",&ch);
    if((ch>=65)&&(ch<=122))
		{
    ch=ch-32;
    printf("The upper case character corresponding is=%c\n",ch);
}
	else
		printf("Enter Invalid");
    return 0;
    }

11. WAP to change the CAPS of characters i.e. if input character is in capital the output will be in small

    #include<stdio.h>
    int main()
    {
    char ch;
    printf("Enter a character");
    scanf("%c",&ch);
    if((ch>=65)&&(ch<=122))
		{
    ch=ch+32;
    printf("The lower case character corresponding is %c\n",ch);
}
	else 
		printf("Enter Invalid");
    return 0;
    }

10. Consider the choice is input through keyboard. If choice is 1 then find area of triangle. If choice is 3 then find area of rectangle. If choice is 7 then find area of Square. Otherwise find area of circle

#include<stdio.h>
int main()
{
	int i;
	float base,height,area,width,length,area1,side,area2,radius,area3;
	scanf("%d",&i);
	switch(i)
	{
		case 1:
	printf("Enter Base:");
			scanf("%f",&base);
			printf("Enter Height");
			scanf("%f",&height);
			area=0.5*base*height;
			printf("Area of Triangle=%f\n",area);
			break;
		case 3:
			printf("Enter Width:");
				scanf("%f",&width);
				printf("Enter Length:");
				scanf("%f",&length);
				area1=width*length;
				printf("Area of rectangle=%f\n",area1);
				break;
	    case 7:
                printf("Enter Side:");
				scanf("%f",&side);
				area2=side*side;
				printf("Area of Square=%f\n",area2);
			break;
default:
			printf("Enter radius:");
			scanf("%f",&radius);
			area3=3.14*radius*radius;
			printf("Area of Circle=%f\n",area3);
		}
	return 0;
}

9. Consider area of triangle and base are input through keyboard. Find the height of triangle. Now consider this height is as height of rectangle and then ask width from user. WAP for the same.

#include<stdio.h>
int main()
{
	float area,base,height,area_rec,width;
	printf("Area:");
	scanf("%f",&area);
	printf("Base:");
	scanf("%f",&base);
	height=((2*area)/base);
	printf("Height=%f\n",height);
	printf("Area Of Rectangle:");
	scanf("%f",&area_rec);
	width=area_rec/height;
	printf("Width=%f",width);
	return 0;
	}

8. WAP to find the absolute value of a number entered through the keyboard without absolute function using Conditional Operator.

#include<stdio.h>   
int main()  
{  
  int a,b;  
  printf("enter the value of a");  
  scanf("%d",&a);  
  if(a<0)  
  {  
   b=a*-1;  
   printf("\nabsolute value of %d is %d",a,b);  
  }  
  else  
   {  
     printf("\nabsolute value=%d",a);  
   }  
   return 0;  
}  

8. WAP to find the absolute value of a number entered through the keyboard with absolute function using Conditional Operator.

#include<stdio.h>
int main()
{
int m;
printf("enter the value of m:");
scanf("%d",&m);
(m>=0?printf("%d",m):printf("%d",-(-m)));
return 0;
}

6. Any year is input through the keyboard. WAP to determine whether the year is a leap year or not.

#include<stdio.h>
int main()
{
int year;
scanf("%d",&year);
if(((year%4==0)&&(year%100!=0))||(year%400==0))
{
printf("%d is leap year",year);
}
else
printf("%d is not leap year",year);
return 0;
}