Page 65 - Programming Microcontrollers in C

50 Chapter 1 Introduction to C

int na=0,ne=0,ni=0,no=0,nu=0;
int nother=0,c;

while ((c=getchar())!=EOF)
switch( c)
{
case ‘A’:
case ‘a’: na=na+1;
break;
case ‘E’:
case ‘e’: ne=ne+1;
break;
case ‘I’:
case ‘i’: ni=ni+1;
break;
case ‘O’:
case ‘o’: no=no+1;
break;
case ‘U’:
case ‘u’: nu=nu+1;
break;
default:
nother=nother+1;
}
printf(“As=%d, Es=%d, Is=%d, Os=%d, Us=%d and”
“ Others=%d\n” ,na,ne,ni,no,nu,nother);
return 0;
}

This program performs exactly the same function as the earlier one.
The data are read in a character at a time as before. Here, however,
the switch statement is used. The statement switch(c) causes the
argument of the switch to be compared with the constants follow­
ing each of the case statements that follows. When a match occurs,
the next set of statements to follow a colon will be executed. Once
the program starts to execute statements, all of the following state­
ments will be executed unless the programmer does something to
cause the program to be redirected. The break instruction does ex­