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//program to input a string and convert all lowercase letters to uppercase letters and all uppercase letters to lowercase letters #include<iostream.h> #include<conio.h> void main() { clrscr(); char str[10]; int i; cout<<"\nenter a string "; cin>>str; cout<<"\noriginal string is "<<str; for(i=0;str[i]!='\0';i++) { if((str[i]>='A') && (str[i]<='Z')) { str[i]=str[i]+32; } else { str[i]=str[i]-32; } } cout<<"\nconverted string is "<<str; getch(); }