在小枝中查找字符串中的字符

def find_char_in_string(string, target_char):
    for i in range(len(string)):
        if string[i] == target_char:
            return i
    return -1

# 示例用法
string = "Hello, World!"
target_char = "o"
result = find_char_in_string(string, target_char)
if result != -1:
    print(f"找到了目标字符'{target_char}'，位置为{result}")
else:
    print(f"未找到目标字符'{target_char}'")