Code Bot compiler - Online Compiler C. This program reads characters one by one and attempts to change uppercase to lowercase and vice versa, but it prints each character twice and has a loop structure issue. - The program prints the original character `c` after every conversion, so you see...

Online Compiler C

#include <stdio.h> int main() { char c; do { scanf("%c", &c); if (c >= 'A' && c <= 'Z') { int letter=c+32; printf("%c",letter); }else if(c>='a' && c<='z'){ int letter=c-32; printf("%c",letter); }printf("%c",c); } } while (c != '.'); return 0; }

This program reads characters one by one and attempts to change uppercase to lowercase and vice versa, but it prints each character twice and has a loop structure issue.

- The program prints the original character `c` after every conversion, so you see both the converted and original character for each input. Check where the second `printf("%c",c);` is placed and whether it should be there.
- The `do-while` loop has an extra closing brace before `while`, which will cause a compilation error. Look at the brace placement after the `else if` block to ensure the loop body is correctly enclosed.