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写出以下程序运行结果。#include struct st{char c;char s[80];};struct st a[4] = {{'1',"123"}, {'2',"321"}, {'3',"123"}, {'4',"321"}};char * f(struct st t);int main(void){int k;for(k = 0; k < 4; k++){printf("%s\n", f(a+k));}return 0;}char f(struct st *t){int k = 0;while(t->s[k] != '\0'){if( t->s[k] == t->c){return t->s+k;}k++;}return t->s;}第1行输出。第2行输出。第3行输出。第4行输出。

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