用c语言设计一个函数，用于把数字字符串转化成整数，这里假设数字字符串表达的整数为正数。 C语言将一数字字符串转化成整数(不得调用C语言提供的将字符串...
\u7f16\u5199\u4e00\u4e2a\u51fd\u6570\uff0c\u5c06\u4e00\u4e2a\u6570\u5b57\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u4e00\u4e2a\u6574\u65701\u3001\u65b0\u5efa\u4e00\u4e2a \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u5b57.py\uff0c\u5982\u56fe\u6240\u793a\u3002
2\u3001\u4e2d\u6587\u7f16\u7801\u58f0\u660e\u6ce8\u91ca\uff1a# coding=gbk\uff0c\u5982\u56fe\u6240\u793a\u3002
3\u3001int() \u51fd\u6570\u7684\u4f5c\u7528\uff1a\u7528\u4e8e\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u6216\u6570\u5b57\u8f6c\u6362\u4e3a\u6574\u578b\u3002
4\u3001\u5b9a\u4e49\u4e00\u4e2a str1 \u53d8\u91cf\uff0c\u4ee3\u7801\uff1astr1="10"\u3002
5\u3001\u4f7f\u7528 int() \u51fd\u6570\u5c06 str1 \u53d8\u91cf\u8f6c\u6362\u4e3a\u6570\u5b57\u3002
6\u3001\u8fd0\u884c\u811a\u672c\uff0c\u8f93\u51fa str1 \u53d8\u91cf\uff0c\u5982\u56fe\u6240\u793a\u3002
\u4e0b\u9762\u7a0b\u5e8f\u6d4b\u8bd5\u8fc7\u4e86\u6ca1\u6709\u95ee\u9898:
char *p;
int i,j,l,flag;
unsigned long n = 1;
unsigned long new;
l = strlen(str);
p =&str[0];
for(i = 0;i <l;i++)
{
if(*p ='-' )
{
flag = 0;
p++;
continue;
}
for(j = 0;j < l -i -1;j++)
{
n*=10;
}
new+=(*p - 48)*n;
n = 1;
p++;
}
if(flag ==0)
{
new = 0 - new; //\u8fd9\u91cc\u7b80\u5355\u4f46\u5f88\u5b9e\u7528\u6b63\u6570\u8f6c\u8d1f\u6570
}
return new;
#include <stdio.h>
#include <math.h>
int str2Int(const char *str)
{
char a[10];
int i=0,j=0;
int result=0;
while(*str != '\0')
{
if(*str >= '0' && *str<='9')
{
a[j]=*str;
j++;
str++;
}
else
str++;
}
for(i=0;i<j;i++)
{
result+=(a[i]-'0')*(int)pow(10,j-i-1);
}
return result;
}
int main()
{
char ch[80];
printf("String value= ");
scanf("%s",ch);
printf("Int value= %d
",str2Int(ch));
return 0;
}
就是atoi函数啊
很容易的啊
#include <stdio.h>
#define MAX 1000
int main(){
char s[MAX];
int c;
int i, j = 0;
int n = 0;
int pow;
while((c = getchar()) != '
')
{
if (c >= '0' && c <= '9')
s[i++] = c;
else
printf("Invalid, Input!
");
}
if (i > 0)
s[i] = '\0';
for( j = i - 1, pow = 1; j >= 0; j--, pow*=10)
n += (s[j]-'0')*pow;
printf("%d
", n);
return 0;
}
把数字字符串转化成整数
没看懂。
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