请根据C11标准的文法集推导代码 int main() { printf("Hello world!\n"); return 0; }

程序的起始符号为translation_unit，它由external_declaration组成。 external_declaration可以是function_definition，也可以是declaration。因为我们的程序包含一个函数定义，所以我们可以推导出以下文法： translation_unit -> external_declaration external_declaration -> function_definition function_definition -> declaration_specifiers declarator compound_statement declaration_specifiers -> ε declarator -> direct_declarator direct_declarator -> identifier ( ) compound_statement -> { statement_list } statement_list -> statement statement -> expression_statement expression_statement -> expression ; expression -> assignment_expression assignment_expression -> conditional_expression conditional_expression -> logical_or_expression logical_or_expression -> logical_and_expression logical_and_expression -> inclusive_or_expression inclusive_or_expression -> exclusive_or_expression exclusive_or_expression -> and_expression and_expression -> equality_expression equality_expression -> relational_expression relational_expression -> shift_expression shift_expression -> additive_expression additive_expression -> multiplicative_expression multiplicative_expression -> cast_expression cast_expression -> unary_expression unary_expression -> postfix_expression postfix_expression -> primary_expression primary_expression -> identifier 根据以上文法，我们可以推导出以下代码： int main() { printf("Hello world!\n"); return 0; } 可以被表示为以下语法树： translation_unit | external_declaration | function_definition | | | declarator | | declaration_specifiers ε | compound_statement | statement_list | statement | expression_statement | expression | assignment_expression | conditional_expression | logical_or_expression | logical_and_expression | inclusive_or_expression | exclusive_or_expression | and_expression | equality_expression | relational_expression | shift_expression | additive_expression | multiplicative_expression | cast_expression | unary_expression | postfix_expression | primary_expression | identifier "printf" | string_literal "Hello world!\n"

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请根据C11标准的文法集推导代码 int main() { printf("Hello world!\n"); return 0; }

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请根据C11标准的文法集推导程序，代码如下 int main() { printf("Hello world!\n"); return 0; }

请根据C11标准的文法集对代码“ int main() { printf("Hello world!\n"); return 0; } ”进行文法推导

请根据C11标准的文法集对程序进行推导，代码如下 int main() { printf("Hello world!\n"); return 0; }

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int main() { int n; char s[101]; while(gets(s) != NULL) printf("%d\n", strlen(s)); return 0; } 给出代码

#include<stdio.h> int main() { float a = 0; scanf_s("%6.2f",&a); printf_s("%6.2f",a); return 0; }

always_inline errno_t memset_s_inline (void *s, rsize_t smax, int c, rsize_t n) { u8 bad; bad = (s == 0) + (n > smax); if (PREDICT_FALSE (bad != 0)) { if (s == 0) clib_c11_violation ("s NULL"); if (n > smax) clib_c11_violation ("n > smax"); return (EINVAL); } memset (s, c, n); return (EOK); }

#include <stdio.h> int main(){ char a[100]={"D"}; gets(a); printf("%c",a[0]); return(0); }

#include<stdio.h> int main() { float a, b; float he, cha, ji, shang; scanf_s("%f%f" &a, &b); he = a + b; cha = a - b; ji = a * b; shang = a / b; printf("和:%f\n差:%f\n积:%f\n商:%f\n", he, cha, ji, shang); return 0; }这个哪里错了

分析下列程序include<stdio.h> int main() { int i = 0, j = 0, k = 0, m = 0; char str1[50], str2[5]; gets_s(str1); gets_s(str2); while (str1[i] != '\0') { i++; k++; } while (str2[j] != '\0') { j++; m++; } for (i = 0; i <= k + m; i++) { str1[i + k] = str2[i]; } puts(str1); return 0; }

abc 联系代码hello world hello world

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