### ***Write C prog code to find GCD of two integers. ***Write C prog code to find the area of triangle. ***Write C prog code to show a number positive or negative. ***Write C prog code to find the largest number among three numbers a,b,c. ***Write C prog code to Find LEAP YEAR. ***Write C prog code to transform centigrade temperature to farenhaite temperature. ***Write C prog code to show a character vowel or consonent.

***Write C prog code to find GCD of two integers.

```#include
main()
{
int a,b,x;
printf("Enter the first number ");
scanf("%d",&a);
printf("Enter the second number ");
scanf("%d",&b);
if(a<b)
x=a;
else
x=b;

tt: if(a%x==0&&b%x==0)
printf("The GCD is %d",x);
else
{
x=x-1;
goto tt;
}
}
```

***Write C prog code to find GCD of two integers.(Alternative method)

```#include
main()
{
int a,b,x;
printf("Enter the 1st number ");
scanf("%d",&a);
printf("Enter the 2nd number ");
scanf("%d",&b);
x=(a<b)?a:b;
tt: if(a%x==0&&b%x==0)
printf("The GCD is %d",x);
else
{
x=x-1;
goto tt;
}

}
```

***Write C prog code to find the area of triangle.

```#include
main()
{
float b,h,area;
printf("Enter the value of b ");
scanf("%f",&b);
printf("Enter the value of h ");
scanf("%f",&h);
area=.5*b*h;
printf("The area is %f",area);

}
```

***Write C prog code to find the area of triangle.

``` #include
main()
{
float a,b,c,s,area;
printf("Enter the value of a ");
scanf("%f",&a);
printf("Enter the value of b ");
scanf("%f",&b);
printf("Enter the value of c ");
scanf("%f",&c);
s=(a+b+c)/2;
area=sqrt(s*(s-a)*(s-b)*(s-c));
printf("the area is %f",area);

}
```

***Write C prog code to show a number positive or negative.

``` #include
main()
{
int a;
printf("Enter the number ");
scanf("%d",&a);
if(a>=0)
printf("%d is positive",a);
else
printf("%d is negative",a);
}
```

***Write C prog code to find the largest number among three numbers a,b,c.

``` #include
main()
{
int a,b,c;
printf("Enter the first number ");
scanf("%d",&a);
printf("Enter the second number ");
scanf("%d",&b);
printf("Enter the third number ");
scanf("%d",&c);
if(a>b&&a>c)
printf("The largest number is %d",a);
if(b>c&&b>a)
printf("The largest number is %d",b);
if(c>a&&c>b)
printf("The largest number is %d",c);
}
```

***Write C prog code to Find LEAP YEAR.

```     #include
main()
{
int year;
printf("Enter year ");
scanf("%d",&year);
if(year%400==0||(year%100!=0&&year%4==0))
printf("%d is the leap year",year);
else
printf("%d is not the leap year",year);
}
```

***Write C prog code to transform centigrade temperature to farenhaite temperature.

``` .
#include
main()
{
float f,c;
scanf("%f",&c);
f=(9*c)/5+32;

printf("The result is %f",f);
}
```

***Write C prog code to show a character vowel or consonent.

```#include
main()
{
char vc;
scanf("%c",&vc);
if(vc=='A'||vc=='a')
printf("The letter %c is vowel",vc);
else if(vc=='E'||vc=='e')
printf("The letter %c is vowel",vc);
else if(vc=='I'||vc=='i')
printf("The letter %c is vowel",vc);
else if(vc=='O'||vc=='o')
printf("The letter %c is vowel",vc);
else if(vc=='U'||vc=='u')
printf("The letter %c is vowel",vc);
else
printf("The letter %c is consonent",vc);
}
```