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#include?<bits/stdc++.h> using?namespace?std; int?main() { ????//?字符轉(zhuǎn)大小寫 ????cout?<<?(char)toupper('a')?<<?endl; ????cout?<<?(char)toupper('A')?<<?endl; ????cout?<<?(char)tolower('a')?<<?endl; ????cout?<<?(char)tolower('A')?<<?endl; ????puts("×××××××××××××××××××完××××美××××分××××割××××線×××××××××××××××××××"); ????//char?轉(zhuǎn)?int,long?int,long?long?int,double ????//方法一：atoi?atol?atoll?atof ????char?s1[]="12345654"; ????char?s2[]="123.23"; ????int?n1?=?atoi(s1); ????long?int?n2?=?atol(s1); ????long?long?int?n3?=?atoll(s1); ????double?n4?=?atof(s2); ????cout?<<?n1?<<?'?'?<<?n2?<<?'?'?<<?n3?<<?'?'?<<?n4?<<?endl; ????//方法二：sscanf ????int?a1; ????sscanf(s1,"%d",&a1); ????cout?<<?a1?<<?endl; ????double?a2; ????sscanf(s2,"%lf",&a2); ????cout?<<?a2?<<?endl; ????char?s3[]="AF"; ????int?a3; ????sscanf(s3,"%X",&a3);?//16進(jìn)制轉(zhuǎn)換成10進(jìn)制 ????cout?<<?a3?<<?endl; ????puts("×××××××××××××××××××完××××美××××分××××割××××線×××××××××××××××××××"); ????//cstring?與?string?的轉(zhuǎn)換 ????string?s4?=?"This?is?a?test"; ????char?s5[20]; ????s5.format("%s",?s4.c_str()); ????cout?<<?s5?<<?endl; }

轉(zhuǎn)載于:https://www.cnblogs.com/bestwzh/p/6401779.html

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