if(<condition>)
{
//  code
}
else   //may be or may not be required
{
// code
}

if(<condition>)
{
//  code
}
else if
{
// code
}
else
{
// code
}

switch(<variable to switch on>)
{
  case <one of possible values of variable> : //code
  case <one of possible values of variable> : //code
  case <one of possible values of variable> : //code
  default : //code
}


while(<condition>)
{
// code
}

do
{
// code
}while(<condition>);

for(<initial assignment>;<condition>;<increment/decrement>)
{
// code
}

int i=1;
if(i==1)
{
  printf("Condition is true");
}
else
{
  printf("Condition is false");
}

if(i==1)
{
  printf("Condition1 is true");
}
if(i==2)
{
  printf("Condition2 is true");
}
else
{
  printf("Condition is false");
}

switch(i)
{
  case 1 : printf("Condition1 is true"); break;
  case 2 : printf("Condition2 is true"); break;
  case 3 : printf("Condition3 is true"); break;
  default: printf("Condition is false"); break;
}

while(i<10)
{
 printf("Inside while for i=%d",i);
 i = i+1;
}

do
{
 printf("Inside do while for i=%d",i);
 i = i+1;
}while(i<20);

for(i=0;i<10;i++)
{
  printf("Inside for i=%d",i);
}