atoi函數(shù)：把char類型的字符串轉(zhuǎn)化為整形數(shù)    int n;    char str[] = "12345.67";    n = atoi(str);    n=12345

sPRintf函數(shù)：把整形數(shù)轉(zhuǎn)化為一個(gè)字符串保存在char數(shù)組中sprintf(s, "%d", 123); //產(chǎn)生"123"sprintf(s, "%8x", 4567); //小寫16 進(jìn)制，寬度占8 個(gè)位置，右對(duì)齊sprintf(s, "%-8X", 4568); //大寫16 進(jìn)制，寬度占8 個(gè)位置，左對(duì)齊