Input and Output

• 7.1 upper case to lower or lower case to upper
• 7.2 print non-graphic characters in octal or hexadecimal
• 7.3 minprintf to handle facilities of printf
• 7.4 private version of scanf
• 7.5 Postfix calculator using scanf
• 7.6 Compare Two files
• 7.7 Pattern matching program with files
• 7.8 Print Pages to Files
• 7.9 Analyze implementations of isupper