代码如下:
#!/bin/bash
#name: upper_to_lower.sh
#the function is trun uper to lower
#like ABCd to abcdhaveuppernumber()
{
#test if the string have upper number
str=”$(echo $1 | tr [:upper:] [:lower:])”
if [ “$str” != $1 ] ; then #get some problem
echo “[#have upper number,and i well trun them to lower:#]”
return 1 #have upper number
else
return 0 #no upper number
fi
}if [ $# -ne 1 ] ; then
echo “Usage: $0 ” >&2
exit 1
fiif ! haveuppernumber $1 ; then #when if is 0 it run?
#if [ 0 ] ; then #in shell true return 0 ,false return 1
echo $1 | tr [:upper:] [:lower:] #it can turn the UPPER number to lower
# echo $1 | tr [:lower:] [:upper:] #it can turn the lower number to UPPER
else
echo “[#no upper number:#]”
echo $1
fiexit 0
功能说明:当输入”./upper_to_lower.sh AaBbCcdd“时会先判断输入格式是否正确,然后判断字符串中是否有大写字母如果有显示”[#have upper number,and i well trun them to lower:#]”和转换成小写字母后的字符串;如果没有大写字母显示”[#no upper number:#]”和小写字符串。
然后又试着用c语言实现相同的功能,如下:
代码如下:
#include
#include<stdlib.h>int haveuppernumber(char *p)
{
char*q=p;
for(;*q!= ;q++)
{
if(*q>=A&&*q<=Z)
{
printf(“[#have upper number and i will turn them to lower #]n”);
return 1;
}
}
printf(“[#no upper number#]n”);
return 0;
}
void turntolower(char *p)
{
for(;*p != ;p++)
{
if(*p>=A && *p<=Z)
{
*p+= ;
}
}
}int main(int argc , char *argv[])
{
char *p;
p=argv[1];if(argc != 2)
{
printf(“Usage : %sn”,argv[0]);
exit(-1);
}
if(haveuppernumber(p))
{
turntolower(p);
printf(“%sn”,argv[1]);
}
else
{
printf(“%sn”,argv[1]);
}
return 0;
}
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