基本数据类型与字符串的转换

/*
基本数据类型与字符串的相互转换
 基本数据类型(int,float,double char)
	1> int类型转换成字符串
	2> float->NSString
	3> double->NSString
	4> char->NSString
	5> NSString->int
	6> NSString->float
	7>NSString->double
	8>将字符串中的字母转化成大写
	9>将字符串的字母转换成小写
	10>将首字母大写
 */
int main(int argc, const char * argv[]) {
    @autoreleasepool {

        int i = 5;
        NSString * str = [[NSString alloc] initWithFormat:@"%d",i];
        NSLog(@"%@",str);

        float f = 9.8;
        NSString * str1 = [[NSString alloc] initWithFormat:@"%.2f",f];
        NSLog(@"%@",str1);

        double d = 4.5677;
        NSString * str2 = [[NSString alloc] initWithFormat:@"%.6f",d];
        NSLog(@"str2 %@",str2);

        char c = 'a';
        NSString * str3 = [[NSString alloc] initWithFormat:@"%c",c];
        NSLog(@"%@",str3);

        NSString * str4 = @"10";
        int i1 = [str4 intValue];
        NSLog(@"%d",i1);

        NSString * str5 = @"1.5";
        float f1 = [str5 floatValue];
        NSLog(@"%.2f",f1);

        NSString * str6 = @"7.98";
        double d1 = [str6 doubleValue];
        NSLog(@"%.5f",d1);

        NSString * str7 = @"i386";
        int i2 = [str7 intValue];
        NSLog(@"%d",i2);

        NSString * str8 = @"baidu";
        NSString * str9 = [str8 uppercaseString];
        NSLog(@"%@",str9);

        NSString * str10 = @"CHINA";
        NSString * str11 = [str10 lowercaseString];
        NSLog(@"%@",str11);

        NSString * str12 = [str10 capitalizedString];
        NSLog(@"%@",str12);

    }
    return 0;
}

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