Conversion of uppercase/lowercase letters in C Language

Source: Internet
Author: User

Conversion of uppercase/lowercase letters in C Language

# Include <stdio. h> int main () {int ch = 0; while (ch = getchar ())! = EOF)/* ctrl + z, is to read the input character to the ch word, until the end of the file (the full name of EOF is end of file, is the end of the file mark, every input is included), where! = Indicates that the end of the file is not read. */{if (ch> = 'A') & (ch <= 'Z') {ch = ch-32 ;} else if (ch> = 'A') & (ch <= 'Z') {ch = ch + 32 ;} else if (ch> = '0') & (ch <= '9') {continue; // terminate this loop} putchar (ch ); // output character} return 0 ;}


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