int isalpha(int c)
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2023-12-01
描述 (Description)
C库函数void isalpha(int c)检查传递的字符是否是字母。
声明 (Declaration)
以下是isalpha()函数的声明。
int isalpha(int c);
参数 (Parameters)
c - 这是要检查的字符。
返回值 (Return Value)
如果c是字母表,则此函数返回非零值,否则返回0。
例子 (Example)
以下示例显示了isalpha()函数的用法。
#include <stdio.h>
#include <ctype.h>
int main () {
int var1 = 'd';
int var2 = '2';
int var3 = '\t';
int var4 = ' ';
if( isalpha(var1) ) {
printf("var1 = |%c| is an alphabet\n", var1 );
} else {
printf("var1 = |%c| is not an alphabet\n", var1 );
}
if( isalpha(var2) ) {
printf("var2 = |%c| is an alphabet\n", var2 );
} else {
printf("var2 = |%c| is not an alphabet\n", var2 );
}
if( isalpha(var3) ) {
printf("var3 = |%c| is an alphabet\n", var3 );
} else {
printf("var3 = |%c| is not an alphabet\n", var3 );
}
if( isalpha(var4) ) {
printf("var4 = |%c| is an alphabet\n", var4 );
} else {
printf("var4 = |%c| is not an alphabet\n", var4 );
}
return(0);
}
让我们编译并运行上面的程序,产生以下结果 -
var1 = |d| is an alphabet
var2 = |2| is not an alphabet
var3 = | | is not an alphabet
var4 = | | is not an alphabet