You only may lack of knowledge of how to structure a program. Here is some good tutorial
how to learn C.
Some tips:
You can declare arrays of objects (instances of a class):
Currency arrayCurr[10];arrayCurr[0] = new Currency();arrayCurr[0].name = "swiss franc";
for( int i = 0; i < 10; i++ ) {
if( Mycheck( arrayCurr[i] ) == true ) {
}
}
delete arrayCurr[0];