将字符串转换为数字

2019-11-11 05:14:05

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下列函数可以将字符串转换为数字：

函数名作用

atof() 将字符串转换为双精度浮点型值 atoi() 将字符串转换为整型值 atol() 将字符串转换为长整型值 strtod() 将字符串转换为双精度浮点型值，并报告不能被转换的所有剩余数字 strtol() 将字符串转换为长整值，并报告不能被转换的所有剩余数字 strtoul() 将字符串转换为无符号长整型值，并报告不能被转换的所有剩余数字

/* strtod example */#include <stdio.h> /* PRintf, NULL */#include <stdlib.h> /* strtod */int main (){ char szOrbits[] = "365.24 29.53"; char* pEnd; double d1, d2; d1 = strtod (szOrbits, &pEnd); d2 = strtod (pEnd, NULL); printf ("The moon completes %.2f orbits per Earth year./n", d1/d2); return 0;}/* strtol example */#include <stdio.h> /* printf */#include <stdlib.h> /* strtol */int main (){ char szNumbers[] = "2001 60c0c0 -1101110100110100100000 0x6fffff"; char * pEnd; long int li1, li2, li3, li4; li1 = strtol (szNumbers,&pEnd,10); li2 = strtol (pEnd,&pEnd,16); li3 = strtol (pEnd,&pEnd,2); li4 = strtol (pEnd,NULL,0); printf ("The decimal equivalents are: %ld, %ld, %ld and %ld./n", li1, li2, li3, li4); return 0;}/* strtoul example */#include <stdio.h> /* printf, NULL */#include <stdlib.h> /* strtoul */int main (){ char buffer [256]; unsigned long ul; printf ("Enter an unsigned number: "); fgets (buffer, 256, stdin); ul = strtoul (buffer, NULL, 0); printf ("Value entered: %lu. Its double: %lu/n",ul,ul*2); return 0;}

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