C language programming third edition Su Xiaohong 5.7 keyboard input characters, change uppercase letters to lowercase letters, lowercase letters to uppercase letters, and output ASCII codes - Code World

C language programming third edition Su Xiaohong 5.7 keyboard input characters, change uppercase letters to lowercase letters, lowercase letters to uppercase letters, and output ASCII codes

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C language programming third edition Su Xiaohong 5.7 keyboard input characters, change uppercase letters to lowercase letters, lowercase letters to uppercase letters, and output ASCII codes

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