大小写转换
https://www.nowcoder.com/practice/4e089ee8966a4ed4b306f64e68d45264
#include <stdio.h>
int main() {
char abc;
while ((abc=getchar())!=EOF) {
if(abc >= 'A' && abc <= 'Z'){
abc+=32;
}else if(abc >= 'a' && abc <= 'z'){
abc -= 32;
}
putchar(abc);
}
return 0;
}
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const flattern = (obj) => {
const res = {};
const dfs = (curr, path) => {
if(typeof curr === 'object' && curr !== null) {
const isArray = Array.isArray(curr);
for(let key in curr) {
const newPath = path ? isArray ? `${path}[${key}]` : `${path}.${key}` : key;
dfs(curr[key], newPath);
}
} else {
res[path] = curr
}
}
dfs(obj);
return res;
}
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