Implementation of function isLetterOfAlphabet().

src/stringManipulation.c

@@ -79,6 +79,16 @@ bool everyCharacterIsDigit(char *string)
 	return onlyDigits;
 }
 
+bool isLetterOfAlphabet(char *string){
+	bool r = true;
+	for(int i=0;*(string+i)!='\0';++i){
+		if( !(*(string+i)>=65&&*(string+i)<=90) && !(*(string+i)>=97&&*(string+i)<=122)){
+			r = false;
+			break;
+		}
+	}
+	return r;	
+}
 
 unsigned int toUnsignedInteger(char *ID)
 {

src/stringManipulation.h

@@ -10,4 +10,5 @@ char *generateCheckString(unsigned int, char *);
 unsigned int toUnsignedInteger(char *);
 unsigned int power(unsigned int, unsigned int);
 bool everyCharacterIsDigit(char *);
+bool isLetterOfAlphabet(char *);
 #endif