二十五岁时我们都一样愚蠢、多愁善感，喜欢故弄玄虚，可如果不那样的话，五十岁时也就不会如此明智。
标题：C库函数 islower()
C库函数 islower()
#include <stdio.h> #include <ctype.h> int main () { int var1 = 'Q'; int var2 = 'q'; int var3 = '3'; if( islower(var1) ) { printf("var1 = |%c| is lowercase character\n", var1 ); } else { printf("var1 = |%c| is not lowercase character\n", var1 ); } if( islower(var2) ) { printf("var2 = |%c| is lowercase character\n", var2 ); } else { printf("var2 = |%c| is not lowercase character\n", var2 ); } if( islower(var3) ) { printf("var3 = |%c| is lowercase character\n", var3 ); } else { printf("var3 = |%c| is not lowercase character\n", var3 ); } return(0); }
