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#include <stdio.h>
#include <string.h>
#include <ctype.h>
 
 
char* cek(char kalimat[][100],int a){
 
	for(int i=0; i<strlen(kalimat[a]); i++){
		if(i%2 == 0 ){
			kalimat[a][i]=toupper(kalimat[a][i]);
		}
		else{
			kalimat[a][i]=tolower(kalimat[a][i]);
		}
	}
	return kalimat[a];
}
 
int main() {
	int t, total=0;
	char kalimat[100][100];
 
	do{
		scanf("%d", &t); fflush(stdin);
	}while(t>100);
 
	for(int i=0; i<t; i++){
		scanf("%s", kalimat[i]); fflush(stdin);
		strcpy(kalimat[i], cek(kalimat, i));
	}
 
	for(int i=0; i<t; i++){
		printf("%s\n", kalimat[i]);
	}
 
	getchar();
	return 0;
}
 

prog.c: In function ‘cek’:
prog.c:8:2: error: ‘for’ loop initial declarations are only allowed in C99 mode
  for(int i=0; i<strlen(kalimat[a]); i++){
  ^
prog.c:8:2: note: use option -std=c99 or -std=gnu99 to compile your code
prog.c: In function ‘main’:
prog.c:27:2: error: ‘for’ loop initial declarations are only allowed in C99 mode
  for(int i=0; i<t; i++){
  ^
prog.c:32:10: error: redefinition of ‘i’
  for(int i=0; i<t; i++){
          ^
prog.c:27:10: note: previous definition of ‘i’ was here
  for(int i=0; i<t; i++){
          ^
prog.c:32:2: error: ‘for’ loop initial declarations are only allowed in C99 mode
  for(int i=0; i<t; i++){
  ^
prog.c:20:9: warning: unused variable ‘total’ [-Wunused-variable]
  int t, total=0;
         ^

Standard output is empty